根據(jù)句意及漢語(yǔ)提示完成下列句子。

1．我的爺爺過(guò)去經(jīng)常生病，現(xiàn)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(gè)男孩很聰明，他每天自學(xué)法語(yǔ)。

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

3．動(dòng)植物需要充足的水分，沒(méi)有水它們不能生存。

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

4．對(duì)不起，我把你錯(cuò)當(dāng)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(shí)也建起了相當(dāng)多的新建筑。

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