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

— Don't gave up．

— But what can we do?I can't see there is a chance ________ we will win．

A．if

B．which

C．whether

D．that

— Your cousin Tom was caught steaing by the police yesterday．

— ________ he did so has nothing to do with me．

A．Whatever

B．No matter what

C．That

D．Whether

— We're late．The play has started．

— I wonder how log ago ________

A．it began

B．did it begain

C．was it beganing

D．it has begun

— what about your history test?

— I have answered all the questions,but I'm not sure ________ I have got them all right．

A．what

B．how

C．that

D．why

— Have a nice trip!

— Thanks．I'll telephone you from ________ I get to by tomorrow evening．

A．wherever

B．every place

C．whever

D．no matter where

— Can you get everything ready by the weekend?

— It all depends on ________ we can get Mr Green's cooperation．

A．that

B．what

C．whether

D．if

— Don't you believe me?

— ________,I Will believe ________ you say．

A．No;whatever

B．Yes;no matter what

C．No;no matter what

D．Yes;whatever

— I wonder ________ Bob is so dressed up today．

— He must be going to a job interview．

A．where

B．why

C．what

D．how

________ world scientists call the“superquake”has killed more than 150,000 people．

A．What

B．Where

C．Why

D．That