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1.He ____(know) a lot about Europe.Let's go and ask him.

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1.He ____(know) a lot about Europe.Let's go and ask him.
2.I ____(be) to Paris twice,but I have never been to London.
3.The teacher ____(walk) into the classroom with a book in his hand.Be quiet!
说明道理,
1.knows he是第三人称单数,所以know后面加s.
2.have been to 对照后面的内容就可以.have been to 表示去过,已经回来了.have gone to 表示已经去了,还没回来.
3.is walking. be doing表示正在做.老师正走进.