I can hardly believe two of them ________ the enemies.

A．defeat

B．defeating

C．to defeat

D．to have defeated

He tried a third time, he was unsuccessful, ________.

A．either

B．yet

C．though

D．till

The computer center, ________ last year, is very popular among the students in this school.

A．open

B．opening

C．having opened

D．opened

You can take the lift, which is ________ by electricity.

A．lifted

B．made

C．operated

D．done

——How did you spend your holidays in the USA?

——We went to a city ________ the west coast and stayed in a hotel which was fifteen miles ________ the coast.

A．from; on

B．on; from

C．to; on

D．in; to

Would you go and see ________ outside?

A．what to take place

B．what Tom has happened

C．what is happening

D．what the matter had been

Suddenly he fell over some stones ________ lying on the ground.

[　　]

－Let's fix a date ________ the meeting before we do anything else, shall we?

－Ok, let's make ________ 2:30 tomorrow afternoon.

[　　]

________ is known to everybody, Taiwan is a part of China. We must unify it.

[　　]

________ no need for us to discuss the problem again since it has already been settled.

[　　]