These wild flowers are so special that I would do ________ I can to save them．

A．whatever

B．that

C．which

D．whichever

The man is ready to accept ________ help he can get．

A．whichever

B．however

C．whatever

D．whenever

Information has been put forward ________ more middle school graduates will be admitted into universities．

A．while

B．that

C．when

D．as

Some researchers believe that there is no doubt ________ a cure for AIDS will be found．

A．which

B．that

C．what

D．whether

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

A．that

B．when

C．what

D．how

I like ________ in the autumn when the weather is clear and bright．

A．this

B．that

C．it

D．one

________ in the regulations that you should not tell other people the password of your e-mail account．

A．What is required

B．What requires

C．It is required

D．It requires

What the doctors really doubt is ________ my brother will recover from the serious disease soon．

A．when

B．how

C．whether

D．why

________ we'll go camping tomorrow depends on the weather．

A．If

B．Whether

C．That

D．Where

Elephants have their own way to tell the shape of an object and ________ it is rough or smooth．

A．if

B．whether

C．how

D．what