用所给词的适当形式填空
【小题1】Don't put ______（they）in dirty water.
【小题2】Goldfish often eat _________（specially）fish food
【小题3】They often go to the cinema ________（one）a month.
【小题4】Can you tell me ______（much）about them？
【小题5】_________（goldfish）are very expensive. Do you think so？