—What are you doing, John? Why stop?—To be on the safe side, we’d fill up the car now for we _______ run out of gas on the way.
Mr. Wang decided to devote all his time_______ his spoken English before going abroad.
It's difficult to ______ the discussion with all this noise around us.
--- _______ for the glass. ---It’s OK .I ‘m wearing shoes
It is often said that _______famers lead _______very hard but simple life.
_______, when I went to town to see my sick teacher, he said to me, “I’ll come back to school again _______.”