I didn’t know ________ the professor would give us a lecture in the hall.

A. where B. when C. whatD. why

.The school meeting ________ once every two weeks in the concert hall.

A. is held B. was held

C. will be heldD. has been held

Father was very angry because his favorite glass ________ by his pet dog.

A. broke B. has broken

C. was broken D. has been broken

Mr. Lee spent the final time of his life in writing after finding out that he ________ soon.

A. would die B. will die

C. died D. has died

To save water, the parents told their children ________ their teeth under a running tap.

A. to brush B. not brushing

C. not to brush D. brushing

Before you start this task, you ________ realize its importance of doing it.

A. may B. can

C. ought to D. would

Jerry ________ with a stranger when I met him on the way to work yesterday.

A. was arguing B. would argue

C. argued D. is arguing

________ exciting music the woman is playing!

A. How B. What

C. How anD. What an

Never visit strange websites, ________ the thieves may crack(破译)the password of your Internet account.

A. or B. and

C. butD. so

________ people go abroad, they have to bring their passports with them.

A. Until B. When

C. Because D. Before