根据句意及汉语提示完成下列句子。

1. 我的爷爷过去经常生病,现在由于锻炼非常健康.

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

2. 那个男孩很聪明,他每天自学法语.

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

3. 动植物需要充足的水分,没有水它们不能生存.

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

4. 对不起,我把你错当成你弟弟了.

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

5. 孩子们正盼望着春节的来临.

    The children are ______ ________ to the Spring Festival.