【推荐1】Mr. Liu asked us to ________ (比较) the first report with the second to find their differences.

【推荐2】You can c________ the prices of different products when shopping online and choose the cheapest one.

【推荐3】It’s interesting to c____（比较）their school and ours.

【推荐1】Complete the sentences with the given words in their proper forms（用括号中所给单词的适当形式完成下列句子）
1. Peter is always ready to help others. He is very ____________.（help）
2. Robert has a ____________ relationship with his customers. （friend）.
3. We should not ____________ our rivers with waste. （pollution）
4. Ladies like going ____________ more than men do. （shop）
5. This is a photograph of our teachers and ____________. （we）
6. It'll be Grandpa's ____________ birthday next Friday. （sixty）

【推荐3】To make Electrolyte water (电解质水) by yourself, you should _______ a lemon first. (切开)