1.The children are coming____the classroom.
A.at B.out of C.on
回答：选B.这句话的意思为：同学们正在走出教室.从教室里走出用come out of.
2.Whose father is a worker?____,I don't know.
A.Excuse me B.Pardon C.Sorry
回答：选C.这句话的意思为：谁的父亲是一个工人?对不起,我不知道.在给对方说我不知道时应含有抱歉的意思,要表示抱歉的意思就只有用sorry,所以选C.