New Words：

insist [in'sist] v.坚持；坚决要求；坚决主张；固执己见
insist on/upon sth
insist on/upon doing sth

Sample Sentences：

He insisted that he had done right.
I didn't want to go but he insisted.
If you insist on leaving now, please go ahead.
We insist on the highest standards at all times.

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