根据句意及汉语提示，用短语的恰当形式完成下列句子
【小题1】I _____ （熬夜）yesterday, because there was lots of homework to do.
【小题2】________, （使我们吃惊的是）Tom who never learns English, got the highest score in the class in the first-month exams.
【小题3】He ______（更喜欢）stay at home rather than go out if let him choose.
【小题4】I have to set out to see a doctor ________ （因为）headache now.
【小题5】We have _______ (成功) finishing the task that our boss asked us to do.
