________ I meet him, I always think of the things which happened between us.
| A．Every time | B．For the time | C．The night | D．At no time |
He could speak English fluently because he __________ it for four years when he was a college student.
| A．had studied | B．have been studying | C．studied | D．was studying |
Looking at my mother's ___________ face, I regretted not having told her my whereabouts on the phone.
| A．worrying | B．worried | C．anxioused | D．satisfied |
--This decision really upsets me.
--- _______, Ellen. Things will work out well.
| A．Don't mention it | B．I don't think so. |
| C．No problem | D．Take it easy. |
These suggestions are perfectly in _____ tune with our thoughts on ______ subject.
| A．the; the | B．/ ; the | C．/ ; / | D．a; the |
When first____ to the market, these products enjoyed great success.
| A．being introduced | B．having introduced | C．introduced | D．introducing |