用所给单词或短语的适当形式填空。每单词或短语限用一次
fall down look for happen pollute wake up
【小题1】How dangerous it was last night! The buildings __________ with people inside!
【小题2】It __________ the environment very much if we don't stop pouring dirty water into rivers.
【小题3】-What is the woman doing?
-She __________ her cousin, Susan.
【小题4】We never know what __________ in the following days.
【小题5】His daughter often __________ in the middle of the night.