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根據句意及漢語提示完成下列句子。

1．我的爺爺過去經常生病，現在由于鍛煉非常健康。

My grandfather _________ _________ be ill，but now he is quite healthy because of exercise．

2．那個男孩很聰明，他每天自學法語。

The boy is very clever．He _________ _________ French every day．

3．動植物需要充足的水分，沒有水它們不能生存。

Plants and animals need _________ _________ water，and they can't live without it．

4．對不起，我把你錯當成你弟弟了。

I am very sorry that I _________ you _________ your brother．

5．這座城市推掉了許多舊房子，同時也建起了相當多的新建筑。

The city_________ _________ many old buildings and built quite a few new ones．