Noun Clauses

One basic question psychologists have tried to answer is __________________ .

• (A) people learn

• (B) how people learn

• (C) people learn how

• (D) how do people learn

_______________ begin their existence as ice crystals over most of the earth seems likely.

• (A) Raindrops

• (B) If raindrops

• (C) What if raindrops

• (D) That raindrops

It was in 1875 _________________ joined the staff of the astronomical observatory at Harvard University.

• (A) that Anna Winlock

• (B) Anna Winlock, who

• (C) as Anna Winlock

• (D) Anna Winlock then

In order to grow vegetables properly, gardeners must know ___________________________________.

• (A) what the requirements for each vegetable are

• (B) that the requirements for each vegetable

• (C) what are each vegetable’s requirements

• (D) that is required by each vegetable

For many years people have wondered ___________ exists elsewhere in the universe.

• (A) that life

• (B) life which

• (C) whether life

• (D) life as it

(A) Exactly when (B) was the wheel (C) invented is (D) not known.

• A

• B

• C

• D

(A) Although geologists have a (B) clearly understanding of why earthquakes (C) occur, they cannot reliably predict when (D) they will take place.

• A

• B

• C

• D

Art critics (A) do not all agree on what (B) are the qualities that (C) make a painting (D) great.

• A

• B

• C

• D

A test pilot (A) tries out new (B) kinds of aircraft (C) to determine if (D) are they safe.

• A

• B

• C

• D

Early in the eighteenth century, Halley accurately predicted when ____ of 1682 would return.

• (A) the comet

• (B) was the comet

• (C) the comet was

• (D) had the comet