We tried ________ the window, but it was still hot in the room.
| A．to open | B．opening |
| C．open | D．opened |
We did have a quarrel about money last night, but now we havealready __________.
| A．taken up | B．made up |
| C．put up | D．brought up |
When __________ whether Chinese could develop their own missiles,
Qian Xuesen said Chinese could do anything that foreigners coulddo.
| A．asked | B．asking |
| C．to asked | D．having asked |
The girls burst out laughing when I began to make a speech, —__________，of course, made me feel embarrassed.
| A．which | B．what |
| C．that | D．why |
—I have got a headache.
—__________. You have been working in front of computer too long.
| A．No way | B．No problem |
| C．No wonder | D．Not yet |
My parents would have come to see you if it had been possible, but they __________ so busy.
| A．were | B．had been |
| C．have been | D．would be |