1. 选词填空

although,  keep,  stream,  tour,  worry

1. （1） We hope all the people will take part in our city clean.
3. （2） Some people still throw rubbish into the , and this causes water pollution.
5. （3） I have tried many times, I still don't know how to solve this problem.
7. （4） Some people still go out in this special period, so I am about their health condition.
9. （5） In such a serious situation, very few come to our city for a visit.