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2.He always goes to bed after he finishes his homework. (同义句)
He always doesn't go to bed until he finishes his homework
3.When he sees his lost bike, he is very surprised. (同义句)
He is very surprised __to ___ __see___ his lost bike.
4. He uses a knife to cut the apple. (同义句)
He __cuts_____ the apples __with_____ a knife.