根据括号内的汉语提示，完成句子。(每空一词)
The young man found it difficult to have dinner because some of his ____ (牙齿)had been pulled out.
Tom and Linda have been____ ( 结婚) for ten years, but they've never quarreled.
If you want to become a good Marathon athlete, you must practice ____ (跑步) every day.
He manages over 100 big companies, He is considered to be one of the most ____ (成功的) businessmen in China.
Their answers to the question were not the same, that's to say, they answered the question____ (不同地).
When you communicate with your American e-pal on the internet, the e-mails are supposed to be____ (写) in English.

“观察DNA和RNA在细胞中的分布”实验中没有用到的试剂是(       )

已知曲线C上的动点M(x,y)和向量a=(x+2,y),b=(x-2,y)满足|a|+|b|=6,则曲线C的离心率是(   )