問題詳情：
詞彙；用括號中所給詞的適當形式填空。
1. We should speak to the old _________ (polite).
2. It’s difficult for him to make a (decide) right now.
3. （read）aloud can improve your pronunciation.
classroom (clean) by the students every day.
5. (leaf) turn yellow in autumn.
【回答】
1. tely 2. decision 3. Reading
4. is cleaned 5. Leaves
知識點：構詞法
題型：完成句子
