People must plant trees to prevent sandstorm_____ A from happening B to happen C happen

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• 1 I ___ my dictionary at home ,so I have to use my classmate today.A left B forgot C have left D have forgotten2 What ______ to you A happen B happened C happens D happening 3 waht did you see Susan?Oh,I saw many people ____ trees on the hill A to plant B planting C planted D plant4Will you help ____ (hand ) out these notebooks 为什么原形 1 C 2 B 3 B 我要理由呀!
• PS:请写出为什么1.Now that we've discussed our problem,are people happy with decisions _____?A.taking B.take C.taken D.to take2.What do you consider ____ to him now?A.happening B.to happen C.has happened D.will happen3.I find it astonishing that John ____ he so rude to me.A.should B.must C.might D.ought to4.The manager has been in ____ lately that we have to put off the meeting till next Monday.A.so poor health B.such poor health C.such a poor health D.so po
• We must do our best to prevent that kind of thing( )againA.happening B.to happen C.happen D.happened应该选哪一个呢,为什么我觉得这题表示被发生,可是happen无被动,所以到底是该选A还是选D呢?
• We must do everything possible to prevent such things from___againA.happening B.to happen C.happen选什么为什么?
• People must plant trees to prevent sandstorm_____ A from happening B to happen C happen
• 79乘14+16乘22-16用简便算法.
• 英语句型转换：He didn't see anything just now.He __ __ just now.