A)用所给词的适当形式填空。
【小题1】It's said that the police ___________(try) their best to catch the robbers these days.
【小题2】We must work hard at the __________(begin) of the new school year.
【小题3】He _________(lie) in bed and read a book, but soon he felt asleep.
【小题4】We will go to the USA as soon as the holiday ___________(begin)．
【小题5】We all know that trees can produce oxygen to keep people __________(live)．