That is __________ the problem lies.

A. how B. when

C. where D. what

__________ they will not come to join us, we have to change our plan.

A. Seeing that B. When

C. For D. As soon as

Tom is one of the boys who __________ on time.

A. is B. are

C. am D. was

You’d better take something to read when you go to see the doctor __________ you have to wait.

A. even if B. as if

C. in case D. in order that

---How long do you think it will be __________ China sends a manned spaceship to the moon?

--- Perhaps two or three years.

A. when B. until

C. that D. before

Cook was a strict but good captain, __________ usually took care of the sailors on his ship.

A. the one who B. one who

C. that D. he who

We were struck by the limited use __________ their natural resources.

A. those villagers made of

B. which those villagers made

C. for those villagers made of

D. for those villagers making of

There seems to be two causes as I try to figure out __________ that prevents so many children from being as happy as before.

A. how it is B. when it is

C. what it is D. why it is

According to one theory, taking part in high-culture activities makes __________ easy for teenagers to make friends with powerful older people, __________ thus increases the chances of their lives turning out well.

A. that, which B. it, which

C. what, which D. it, what

Because Sarah has always saved __________, she is now able to afford a big house.

A. what little she earns B. how little she earns

C. for little she earns D. with little she earns