—Do you think George has passed the driving test?—No. If so, he ______ his car to our college yesterday.

—What a pity! Their experiment is a failure.—They ________ better under more favorable conditions.

 Something is wrong with the window; it _______ not open.

If she     that Mary would come to see her, she would never have gone to the party.

—What happened to the young trees we planted last week?—The trees _      well, but I_        them．