根据句意及首字母完成句子。1. How long have you been c
题型：填空题
问题：
| 根据句意及首字母完成句子。 1. How long have you been c_____ shells? 2. It's i _____ to drop litter in pubilc. 3. Who can give me some s_____ on how to study English well? 4. As a teacher, he often e_____ us to work hard. 5. Could you s_____ us a good way to solve the problem? |
