根据句意及汉语提示完成句子。 1. We must obey the traffic _____ (规则). 2.They often go out for a walk by the _____ (小溪). 3. It's too dark outside.I can't see the blackboard _____ (清晰地). 4. Has anyone got any _____ ( 建议) for how to solve the problem? 5. You _____ (一定不能) laugh at the people in trouble. 6. Maybe the little boy is _____ (非常饿的). Pass him a piece of bread. 7. The _____ (绳子) was not strong enough, so we must change it.