问题详情：
用括号内所给单词的适当形式填空，使句意完整。
1. It’s ________ ( polite ) to ask a woman’s age in western countries.
2. Martin studies Chinese by ________ ( talk ) to native speakers.
3. We should wash our ________ ( hand ) before meals to keep healthy.
4. Cindy was the ________ ( two ) student to get to school this morning.
5. It rained ________ ( heavy ) in some cities in China last week.
【回答】
lite ing s nd ily
知识点：构词法
题型：完成句子
