作者：沪江英语 来源：互联网 2013-03-12 15:56
After persistent efforts they finally succeeded in the experiment.
He is such a persistent person that it is hard to change his mind.
I crossed the street to avoid meeting him,but he saw me and came running towards me.
He tried to avoid making the same mistake.
Drivers can avoid danger by being careful and alert all the time.
No matter how busy you are,he always insists on coming with you.
They insisted that I deliver a speech at the meeting.
He insisted on her participation in the debute.