There is a new problem involved in the popularity of private cars ________ road conditions need ________

A．that;to be improved

B．which;to be improved

C．where;improving

D．when;improving

It is pretty well understood ________ controls the flow of carbon dioxide in and out the atmosphere today．

A．that

B．when

C．what

D．how

A story goes ________ Elizabeth I of England liked nothing more than being surrounded by clever and qualified noblemen at court．

A．when

B．where

C．what

D．that

I think father would like to know ________ I've been up to so far,so I decide to send him a quick note．

A．which

B．why

C．what

D．how

After Yang Liwei sueceeded in circling the earth,________ our astronauts desire to do is walk in space．

A．where

B．what

C．that

D．how

A modern city has been set up in ________ was a wasteland ten years ago．

A．what

B．which

C．that

D．where

We can't figure out ________ quite a number of insects,birds and animals are dying out．

A．that

B．as

C．why

D．when

The Foreign Minister said,“________ our hope that the two sides will work towards peace”

A．This is

B．There is

C．That is

D．It is

I have always been honest and straight forward,and it doesn't matter ________ I'm talking to．

A．who is it

B．who it is

C．it is who

D．it is whom

Do you have any idea ________ is actually going on in the classroom?

A．that

B．what

C．as

D．which