I'd like to help you, ________.

[　　]

A．no matter difficult how it is

B．it is no matter how difficult

C．no matter how it is difficult

D．no matter how difficult it is

________ you know is just ________ I don't know.

[　　]

I can hardly believe two of them ________ the enemies.

[　　]

You can talk to me ________ you feel lonely.

[　　]

The students, ________ at the way the question was put, didn't know how to answer it.

[　　]

________, some famous scientists have the qualities of being both careful and careless.

[　　]

His first letter came about three years ago, but since then I've heard ________ of him.

[　　]

No Newspaper and no magazine ________ permitted to be taken away from the readingroom.

[　　]

I was interested ________ in the paper that scientists had found out how to talk to whales.

[　　]

－Children like living in rooms ________ with colorful things.

－Right. When I got home yesterday, I saw my daughter ________ her room with cartoon pictures.

[　　]

A．decorated; decorating

B．decorating; decorated

C．decorated; is decorating

D．to be decorated; decorating