It was in the lab______ was taken charge of by Professor Zhang ____ they did the experiment.
What great changes! It’s years since I ____ Chengdu last time.
Research shows that people feel unhappy and worried when they have nothing to do . _______, the happiest are those who are busy.
The first time you talk to a stranger, you should try to ______ him about the personal affairs.
— How about Thursday morning? Say, 10 o’clock?— OK. I’ll be expecting you then.
Many graduates wish to find a career _____ they can use what they have studied, but often no such luck.