根据句意及所给的汉语提示写出单词
【小题1】I'm so tired that l can't move ___（向前移）.
【小题2】We are rowing a boat ___（沿着）the river.
【小题3】Many birds are singing in the ___（森林）.
【小题4】Look! A policeman is helping an old man ___（穿过）the street.
【小题5】It's winter and there are not any ___（树叶）on the trees.