用所给单词的正确形式填空。
【小题1】_______ (do) run on the stairs. You may get hurt.
【小题2】_______ (do) keep your study clean.
【小题3】Fire can be _______ (danger). So don’t play with fire.
【小题4】We should know _______ (safe) first!
【小题5】I am _______ about the _______ trip to Hainan Island. (excite)
【小题6】We _______ (must) keep our classroom clean.
【小题7】_______ (watch) out! The car is coming!
【小题8】_______ (cook) can be fun.
【小题9】In spring, there are _______ (colour) flowers in the park.
【小题10】The story _______ (sound) interesting!