1 . 他为什么不能来？
________ ________ ________ that he can't come?

2 . --- ________ has the 2018 World Cup been on?
---For about two weeks.

A．How soon

B．How far

C．How long

3 . Mr. Black has been in China for six years.（对划线部分提问）
______ ______ has Mr. Black been in China?

4 . How should I forget such important moment? (同义句转换)
________________.

5 . --- ________bargaining is always such great fun?
---Usually people consider it a test to see who can stand their ground longer.

A．What is it that

B．Why is it that

C．What it is that

D．Why it is that