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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.