用所给词语正确形式填空

①Our beautiful classroom ____ (clean) every day.

② Windy does ____ (badly) than me in P. E. .

③The film ____ (be) on for ten minutes when I got to the cinema.

④ —Why are you so happy today?

—Because I ____ (win)the badminton match.

⑤ Maria's parents will go to the airport by taxi because it is raining ____ (heavy).

⑥ It is ____ (say)that many drinks are bad for our health.

⑦ Tom, ____ (not swim) in the river. It's dangerous.

⑧ The apples look good and ____ (sell) well.

⑨I saw Han Mei yesterday. We ____ (not see) each other since we left Beijing.

⑩He told us he ____ (buy) a new house the next year.

一 How long have you         ?

— For three days.

实验室可用如图所示装置进行多个实验探究，请回答下列问题．

（1）若液体A为稀盐酸，试管中发生反应的化学方程式是　 ____，反应现象是 ____．

（2）若液体A为蒸馏水，放置一段时间后试管中的现象是 ____

（3）若一段时间后，观察到浸没在液体A中的铁钉表面覆盖一层红色物质，则试管中发生反应的化学方程式可能是　 ____．

如图所示现象，主要反映了（　　）