很高兴为你解答.

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正确答案是：


【解析】：
1、It was raining hard ,so the sports meeting will be put off 
=The sports meeting will be postponed / delayed because it was raining hard.
= The sports meeting will be postponed / delayed because of the heavy rain.
 解析：put off = postpone= delay 延期；推迟


2、Please 【 don't  move 】that chair,because I've just painted it.
    解析：祈使句的句型.

3、I happened【to meet】my old friend in the street.
  解析：happen to do = do sth by chance 碰巧做某事

4、【Protecting 】 our world is our duty.
  解析：动名词做主语.

5、Why not 【come】and join us in the game?
解析：why not do 为什么不做?


祝开心~!