孔子在三十多岁时开始讲学.
Confucius began to teach .
We should take action to protect animals in (dangerous).
Jim has never been (be) to Mount Tai in China.
Tom and Jerry have a lot in common. Their (they) favorite basketball player is James Hardern.
Would you mind giving me some advice (advice) on how to plant trees?
Henry's uncle is planning (take) a trip to Dunhuang now.