When are you ________ Beijing? 

Which is wrong?

[　　]

I regret ________ to help you.

[　　]

I don't think English ________.

[　　]

I was ________ leave ________ I saw him ________

towards me with a bag in his hand.

[　　]

A．about to, when, running

B．about to, while, running

C．to about, when run

D．about to, when, run

Mr. Smith is going back to Canada ________.

[　　]

I didn't understand the questions ________ were asked in French.

[　　]

Is this the house ________ she was born?

[　　]

We visited a factory ________ makes toys for children.

[　　]

All ________ is needed is a supply of water.

[　　]

That is ________ she wasn’t here on time.

[　　]