I/
1, My brother didn't watch the football match on TV last night.
2, If we keep our enviroment cleaner, we will live a happier and healthier life.
3, Many accidents are caused by dangerous driving.
4, I wish I could speak English fluently.
5, My brother studied English before he went to England.
II/
1. C. going
2, B. must
3, A. buy
4, B. but
5, C. which
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