1. careful of/about/with 小心,注意
（1）Children must be taught to be careful of traffic.
（2）Be careful about what you say.
2. certain of /about 确信,肯定
（1）The witnesses were each perfectly certain of what they said.
（2）Scientists are fairly certain about the effects of hot spots beneath the ocean floor.
3. chair a meeting 主持会议
（1）The next day I chair a meeting with Alibaba senior executives on countering fraud.
（2）President Obama will chair a meeting on July 9 of the 17-nation Major Economies Forum on managing climate change.
4. charge sb. with sth. 控告
（1）They that and because I was under 16, they could not charge me with anything. Besides.
没有,而他们居然相信了,并且因为我未满16岁, 他们也不能以任何罪名指控我 —— 即使。
（2）If you lay hands on me, I will charge you with assault.
5. clear of 没有，不接触，无阻碍；无辜的；摆脱
（1）They dragged the fallen tree clear of the road.
（2）I tried to edge away until I was clear of the crowd.