Ⅰ. 单句语法填空
1. Mr Don looked at me with a (satisfy) smile.
2. The once (pollute) river has become totally clear, with grass along both banks.
3. She could hardly cover her (worry) look.
4. Don’t use words, expressions, or phrases (know) only to people with specific knowledge.
5. The foldable chair (design) by Shirley is most helpful to the elderly.
6. Prices of daily goods (buy) online can be lower than those in some stores.
7. He was doing his homework one Sunday morning when he smelt something (burn).
