We live on the earth. So we must ________ the land, air and water clean.

A. let

B. get

C. keep

D. take

I though I failed my exam yesterday. But I just found out I ________.

A. die

B. passed

C. won

D. finished

梇ou must come to school on time tomorrow.　　

桰 ________.

A. must

B. have to

C. will

D. should

Lin Tao has been in America for several years. He ________ be a big boy now.

A. need

B. must

C. can

D. may

I don't know where she is. She ________ in the school library.

A. maybe

B. must be

C. may be

D. will be

梂hat are you going to eat for lunch?

桰 ________ have noodles.

A. must

B. need to

C. may

D. can

Tom, please ________ the soup to see if I have put enough salt in it.

A. smell

B. feel

C. eat

D. taste

桬xcuse me. Is there my e-mail?

桱ust a minute, please. Let me ________ the computer.

A. check

B. open

C. keep

D. collect

People were very angry and sad to hear that the bad milk powder（劣質(zhì)奶粉）________ the deaths of more than 30 babies.

A. caused

B. put

C. made

D. gave

梂ow, what a beautiful coat! How long have you ________ it?

桾wo weeks.

A. bought

B. got

C. had

D. chosen