用适当的短语完成下列句子。

l. We should ____ ourselves ____ ____ drugs.

   我们应该远离毒品。

2. You need more protein to ____ you ____.

   你需要增加蛋白质以增强体质。

3. His actions could ____ ____ him losing his job. 

   他的行为有可能会导致他丢了工作。

4. He is trying to ____ the family's expenses.

   他正尽力减少家庭开支。

5. If you ____ the sun's rays ____ dry wood with a burning-glass, it will start burning.

   如果你用取火镜使太阳光线聚焦在干木头上，木头就会燃烧起来。