Tell John not to leave the house unless he 　　　　 that the lights ______ .

A. will make sure, turn off　　　　　　　 B. makes sure; are turned off

C. will make sure; will turn off　　　　　　 D. makes sure; will be turned off

Theory ___ practice in turn serves practice.

　 A. is based on B. bases for　 C. are based on　 D. is based for

You can’t imagine ______ a little boy eats ____ many apples.

A. such; such　　　 B. so; so　　　 C. so; such　　　 D. such; so

He is famous ______ his acting ______ an actor.

A.for; for　　　　 B. as; for　　 C. for; as　　　 D. as; as

It’s bad ______ (礼貌) to speak to your parents like that.

_____ is the population of your country?

A. How 　 B. what　 C. How many 　 D. How many

Not once _____ their plan.

A. did they change　　 B. they changed C. changed they　 D. they did change

With a lot of problems _________, the president is having a hard time.

A. settled　 B.are settled C to settle　　　　 D is to be settled

Some insects _______ the color of their surroundings to protect themselves.（ ）

A. take in　　 B. take off　　 C. take on　　 D. take out

My cousin keeps the photo ____ he can see it every day, as it always reminds him of his college days in Florida.

　 A. which　　　　　 B. where　　　　　　 C. whether　　　　 D. when