用所给词的适当形式填空。
【小题1】We all know May is the             (five) month of a year.
【小题2】Too much           (pollute) is bad for our health.
【小题3】Two thirds of the population of our city           (be) worker..
【小题4】He came in while my sister___________ (sleep).
【小题5】I ________(walk) on the road； suddenly a car came to me.