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用方框中单词的适当形式填空。 1.I_________time with my best friend last Sunday. 2.The monitor often _________after-class activities. 3. There will be_________ pollution and fewer cars in the future. 4. Yang Liwei is an astronaut, and he is one of the most famous national_________ . 5.I don't think he _________with you if you do such a silly thing.