It is useless to argue with him. You mightjust____ go to the seaside to argue with the sea.

It was a hard time for those students because of losing the game, but they did not ______ hope.

Scientists say it may be fiveyears ______ it is possible to test this medicine on human patients．

Jim’s mother just wants to know　　　that makes him so nervous.

Is your mother tall or short—________