用括号中所给单词的适当形式填空。
【小题1】Try your best ______（study）, or you will fail in this exam.
【小题2】It took me an hour ______（do）homework last night.
【小题3】He tries to write a story about teenage life so that it ______（come）out in the future.
【小题4】—Is your father at home?
—No, I’m afraid he ______（go）out.
【小题5】I have a ______（collect）of dolls. And my sister ______（collect）stamps.