句型转换。

1. He is doing his homework. (就画线部分提问)

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2. Will they visit their parents tomorrow? (作否定回答)

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3. You can play with fire (改为否定句)

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4. He is going to the zoo next Saturday. (就画线部分提问) 

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5. It is ten yuan. (就画线部分提问)

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根据下列句子所给汉语意思完成句子。

小题1:Just 20% more produce will _______________(意味着…的不同) between sickness and health, between families going hungry and families providing for themselves.

小题2:We hope that you will accept our invitation if __________ (你方便).

小题3:With their help, I have _______________ (取得巨大进步).

小题4:At the same time, he ________________ (为他的迟到向我道歉). 

小题5:It ________ (我突然想起) that I could not waste my time doing nothing any longer.