根据句意，在空白处填一个恰当的词。

1. You should not              eat noodles for supper. You should eat some other food.

2. I often feel              at about 12:00 at noon. It is time for food.

3. After a day's work, my father gets very _______.

4. People should wash their hands             they have meals.

5. It's ______ to keep healthy.

论述藻类在人类生活中的意义。