With his work________,the businessman stepped back to his seat, feeling pleased that he was a man of action.

The__________ that there is life on other planets in the universe has always inspired scientists to explore the outer space.

Don’t trust such people _____ praise you toyour face but speak ill of you behind your back.

Have you noticed the problem ___ he is now in low spirit ? ____ come?

I wish Ia chance to talk to you last night, but you left so early.