If we want to work for our country in the future，________，we should have a strong body and rich knowledge．
| A．the first |
| B．first of all |
| C．for the first time |
| D．after all |
-______are you staying there? -Just for two days.
A. How often B. When C. How long
He leaves ____________ school at half past six.
A. for B to C. In
He is thinking ____________ going to France or Spain for vacation.
A. of B about C. to
He sometimes studies late ____________ 2 am.
A. at B in C until
I like drinking coffee ____________ sugar in it.
A. ofB. with C. to