用所给动词的正确形式填空
【小题1】George returned after the war, only ________ (tell) that his wife had left him.
【小题2】Heavy rain struck Guangzhou in May, ________ (cause) people traffic problems.
【小题3】We mustn't pretend__________________(know)what we don't know.
【小题4】She pretended__________________(read)a novel when I came into the room.
【小题5】The boy pretended__________________(finish)his homework.