--Hi, Jack. Long time no see. Where have you _______ recently?

--To Qingdao on business.

[　　]

He was caught in a traffic jam, and that's _______ he missed the 6∶30 express.

[　　]

Lizzy said she had a lot of interesting ________ during her stay in China.

[　　]

As a farmer, he has ________ agriculture.

[　　]

A. a knowledge about

B. good knowledge of

C. a good knowledge of

D. good knowledges of

--Have you considered ________ there?

--Yes, I am thinking of going there by plane.

[　　]

The scientist spent all his spare time ________ experiments ________ chemistry.

[　　]

--Did you find your watch yesterday?

--No, I didn't find ________, but I've bought ________.

[　　]

We'll correct our mistakes, no matter who points ________.

[　　]

He asked me ________ for the violin.

[　　]

A. did I pay much

B. I paid how much

C. how much did I pay

D. how much I paid

--I didn't expect you would arrive so quickly.

--I came ________ all the way.

[　　]