The computer system broke _____ suddenly while he was searching for information on the Internet．
| A．down | B．out | C．up | D．in |
--I am so happy that John now enjoys big parties.
---Really? He used to in front of strangers.
| A．to host; be shy | B．hosting; being shy |
| C．hosting; be shy | D．to host; being shy |
Jack is late again.It is of him to keep others waiting.
| A．normal | B．typical | C．common | D．ordinary |
If I ______ about this computer program, a hage amount of time and energy would have been saved.
| A．know | B．knew | C．had known | D．have known |
It doesn’t ______ if you are late to my party. I just want you to come
| A．make a decision | B．make a choice |
| C．make a change | D．make a difference |
The man is notreliable, for he seems ______ frankness.
A to lack in B. to be lacking in C. to lack of D. to be lacking of