用括号内所给动词的适当形式填空。 |
1. After a knock at the door, the child heard his mother's voice _____ (call) him. 2. It's no good _____ (waste) strength in shouting. 3. Our group is mainly concerned with bird _____ (conserve) in coastal areas. 4. He felt embarrassed with so many eyes _____ (focus) on his clothes he was wearing. 5. The children talked so loudly at dinner table that I had to struggle _____ (hear). |