(2012·全国卷Ⅰ)I ________ use a clock to wake me up because at six o'clock each morning the train comes by my house.

 “Mike is often absent from class.” “Tell him he _________ answer for it if he goes on behaving like that.”

—I left my handbag on the train, but luckily someone gave it to a railway official.—How unbelievable to get it back! I mean, someone ______ it.

I _________  to the party with you tomorrow if I didn’t have to attend the meeting. 

---Must we leave the classroom now?---No, you _____. You _____ leave after the bell rings.