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.