用所给词的适当形式填空。

1. How important is _____ (keep) healthy to you?

2. Here's part of their _____ (discuss).

3. Cola tastes _____ (good) than water.

4. But I prefer _____ (not eat) too much fried food.

5. This man doesn't mind _____ (eat) burnt food.

如图是肺内及组织中气体交换示意图，据图回答．

①图中A过程叫______，B叫______；

②图中结构：a是______，b是______，c是______，d是______；

③血管e内流的血是______血，血管f内流的血是______血；

④a中的O₂进入b中，b中的CO₂进入a中，这个过程是通过______实现的．