The harder you_______ , the greater progress you______ .
The box _____. Better call in a mechanic(修理工). A isn’t open B hasn’t been open C isn’t be open D won’t open
The workers _____busily when the boss came to look for something she ______in the office. A had worked, had leftB were working ; had left C working ; had left D had worked; left
I’m afraid it will be two months______. A when I come back B when I’ll come back C before I come back D before I’ll come back
---- How is the old man now? ---- Sorry, he ______ though they did all they could to save him.
---- Do you live in this city? ---- No, we ______ it for holidays.