英语：1.there are a lot of sighs around us.(否定句） there ___ ___ sighs around us.
2.nowadays plastic is used to make many things.(保持句意不变）
nowadays plastic is used ___ ___ many things.
3.you'd better stay at home.lt's raining____outside.(heavy)
4.what's your___about this film?(feel)
5.lt is really___.(use)