题目内容：

 

1.Cycling is highly b_________to health and the environment.

2.If you can’t go yourself, try to find someone to s_________for you.

3.W_________to the crash say they saw an explosion just before the disaster.

4.Everyone in the class is expected to p_________actively in these discussions.

5.He gave the homeless children shelter for the night out of s_________for them.

6.Children under 14 must be_________(陪同)by an adult.

7.They went back home,_________ (思考，反思) upon what they had seen.

8.David turned around and walked off in the_________(相反的) direction.

9.They are making_________(准备) to fly Mr. Smith to the nearest hospital.

10.Nowadays many people are willing to do ________ (自愿的) work for their communities.