---Did you enjoy last night’s party?
---No. .
A．It couldn’t be more exciting B．It couldn’t be more boring
C．It couldn’t be more impressive D．It couldn’t be more anxious
To be honest, I would rather my dog out, which made so many troubles.
A．not had let B．I had not le C．not let D．not have let
Jack is late again. It is of him to keep others waiting.
A．typical B．common C．ordinary D．normal
Jack, who pretended , heard, however, every word that was said.
A．not listening B．not to be listened C．not to be listening D．not having listened
The old man __________ in Tibet for two years as a volunteer teacher；it is an experience he often mentions.
A．served B．serves C．is serving D．has served
Qian Xuesen tried many times _________ he found the solution to the puzzle about space technology.
A．after B．before C．since D．when
