飞毛腿移动电源报价:English questions

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1.I really don't know what I shouldn't do next
I really don't know what __________ _________ _______next.
2.In the old days they didn't burn gas for cooking
They __________ _________ burn gas ________cook
3.Some factories cause water pollution they need to be closed
Some factories ______water pollution need _________.

1. I really don't know what not to do next.
2. They formerly never burn gas to cook.
3. Some factories causing water pollution need closing.

1. I really don't know what not to do next.
2. They formerly never burned gas to cook.
3. Some factories causing water pollution need closing.
葡萄藤守护者,第二条答案有个时态不对吧。不过formely我没学过,查了才知道。
基本考的都是不定式么
应该是和我同年级的人问的。