TOEFL: Exercises on NOUN CLAUSES, ADJECTIVE CLAUSES, and ADVERBIAL CLAUSES

Exercises on Noun Clauses

1. Astronomers studied the 1987 supernova to learn…..when a star explodes
1. what happens
2. that happens
3. that is happen
4. what does happen
2. Despite recent attempts to prove…….did indeed reach the north pole in 1909, the evidence still remains questionable.
1. what Robert Peary
2. that Robert Peary
3. Robert Peary who
4. Robert Peary was
3. Around 1789, Antoine Lavoisier was the first person to demonstrate…….all kinds of burning involve the addition of oxygen
1. if
2. what
3. that
4. so that
4. Where …….is the commonest form of color-blindness.
1. are the red and green not easily distinguished
2. they are not easily distinguished red and green
3. are not easily distinguished red and green
4. red and green are not easily distinguished
5. It has been estimated …….milligram of skin scale have over half a million bacteria.
1. that a
2. how a
3. a
4. to be a
6. It is only the last 200 years……have begun climbing mountain.
1. because people
2. that people
3. people
4. as people
7. ……..of smell might, without our realizing it, affect who we choose as friends has been suggested.
1. That our sense
2. Sense
3. For our sense
4. Because our sense
8. From the existence of radio waves, most scientists were convinced ………really happened.
1. the Big Bang was
2. it was the Big Bang
3. how the Big Bang
4. that the Big Bang
9. Samples of rock showed…..4600 million years old.
1. that the moon is
2. how is the moon
3. when is the moon
4. to be the moon
10. ……….was lowered to the sea bed in a glass container to make observations is debated.
1. Alexander the Great who
2. Whether Alexander the Great
3. Alexander the Great
4. What Alexander the Great
11. ………so incredible is that it can grow 385 miles of roots in four months, or about 3 miles in a day.
1. That make the rye plant
2. What makes the rye plant
3. The rye plant
4. The rye plant which was
12. Science fiction writers believe ……..in the future, with new material and greater knowledge, their vision will become reality. 
1. that they
2. they
3. that
4. they will

Exercises on Adjective Clauses

1. The thyroid gland…….., is located in the neck.

a.       where the hormone thyroxin is produced

b.      where produced is the hormone thyroxin

c.       the hormone thyroxin is produced there

d.      at which is produced the hormone thyroxin

2. Dragonflies feed on a large variety of insects……..catch in flight.

a.       in which they

b.      which they

c.       there are to

d.      there are a

3. According to legend, Betsy Rose was the woman……..the first American stars and stripes flag. 

a.       whom she made

b.      made

c.       who made

d.      and she made

4. Pumpkin seeds, ………protein and iron, are a popular snack.

a.       that

b.      provide

c.       which

d.      which provide

5. The spinal cord is a long, thick bundle of nerves………from the brain to the lower part of the back.

a.       that runs

b.      is running

c.       it runs

d.      whom it runs

6. George Pulman introduced a dining car………its own kitchen in 1868.

a.       it had

b.      that had

c.       that it had

d.      having

7. In 1898, ……..pharmacologist, John H. Abel, isolated the hormone adrenaline. 

a.       an American who

b.      who, an American

c.       an American

d.      he was an American

8. Nitrogen gas,……….up about 78 percent of our atmosphere, is constantly being used by plants and animals.

a.       which it makes

b.      it makes

c.       makes

d.      which makes

9. Paper is made from cellulose fibers, ……….in all cells

a.       are

b.      which are

c.       they are

d.      which they are

10. The pepper plant bears a smell, green berry……red as it ripens

a.       which turns

b.      turns

c.       it turns

d.      that it turns

11. Quinine,………once used to cure malaria, was taken from the bark of a South American tree, the cinchona. 

a.       it is a famous drug

b.      is a famous drug

c.       a famous drug

d.      is a famous drug whose

12. Billie Holiday, ………..unique singing style made her famous, was also known as Lady Day.

a.       she is a

b.      whom

c.       who

d.      whose

Exercises on Adverb Clauses

1. Plexiglas is used in aircraft windows………..is almost unbreakable

a.       it

b.      because it

c.       because

d.      it because

2. American Indians grew popcorn for a few thousand years ……..arrival of European explorers in the 1400s.

a.       before

b.      before the

c.       since

d.      since the

3. The body uses proteins for energy……….and fats cannot meet its energy needs.

a.       that carbohydrates

b.      when carbohydrates

c.       when they are carbohydrates

d.      that when carbohydrates

4. Spider monkeys are the best climbers in the jungle, ……….they do not have thumbs.

a.       nevertheless

b.      for

c.       despite

d.      although

5. Stars are hot bodies that gives out light of their own, ……….planets shine only by reflecting light. 

a.       however there are

b.      since

c.       whereas

d.      while they

6. A silkworm has glands that secrete a liquid that hardens into silk …….comes into contact with air. 

a.       as it

b.      when

c.       that

d.      it

7. ………..their immense distances, quasars have relatively high magnitudes. 

a.       Whereas

b.      In spite of

c.       Although

d.      Yet

8. ……….body’s activities put strains on certain bones, these bones strengthen themselves where the stress is greatest. 

a.       That if

b.      That

c.       Because of

d.      If  the

9. ……….Herman Melville is now regarded as one of America’s finest writers, his greatest works mystified readers in his own lifetime.

a.       It is despite

b.      Despite

c.       Even though

d.      In spite of

10. ……….lasers beam can be moved easily in all directions, it can be used for highly accurate cutting in industry.

a.       Because of

b.      It is a

c.       A

d.      As a

11. Limestone powder is added to animal feed……..animals form good strong bones.

a.       why

b.      so that

c.       as a result of

d.      it is that

12. …………sodium chloride (salt) is not used by sea-living organism, it forms the dominant mineral in seawater.

a.       Since

b.      It is since

c.       Although

d.      Although it.

Related Articles: