---- I wonder how much you charge for your services．
---- The first two are free ____ the third costs $30．
| A．while | B．until | C．when | D．before |
___ he could speak again, I left the classroom.
| A．Not until | B．Before | C．After | D．While |
Mr. King will run you back ___.
| A．in his own car | B．with his own car | C．by his own car | D．on car |
The train leaves at 6:00 p.m.So I have to be at the station ___5:40 p.m. at the lastest.
| A．until | B．after | C．by | D．around |
--I’m going to the post office.---____you are there, can you get me some stamps?
| A．As | B．While | C．Because | D．If |
The Whites are ___ holiday.But I don't know where they have gone___ their holiday.
| A．in, for | B．on, for | C．for, in | D．at, on |