It is these poisonous products ________ can cause the systems of the flu．

A．what

B．how

C．that

D．who

－Have you solved the problem?

－________．There’s no way out for me．

A．Not yet

B．Not that

C．Not until

D．Not already

If only he ________ himself and explained who he was, then, of course I should have given him proper service．

A．had introduced

B．introduced

C．has introduced

D．have introduce

－Eight o’clock．Well, it’s time to go．

－________ you stay a little longer?

A．Shouldn’t

B．Needn’t

C．Mustn’t

D．Can’t

Jason ________ the examination, for he didn’t attend it at all．

A．can’t pass

B．couldn’t have passed

C．needn’t have passed

D．could have passed

American country is ________ good reflection of ________ saying－you are what you eat．

A．a, the

B．a, a

C．the, the

D．the, a

Mrs．Smith can hardly drive a car, ________．

A．neither her husband can

B．neither can her husband

C．so her husband can

D．so can her husband

Russia’s winter ________ so warm that a bear in the zoo has awakened from her hibernation two months early．

A．says to be

B．has said to be

C．is said to be

D．had been said to be

However, if there isn’t ________ where you are staying, there are plenty of basketball courts throughout the city．

A．it

B．that

C．one

D．this

Chatting on a computer ________ the shy or uncomfortable feelings that often go along with meeting new people in person．

A．takes away

B．takes in

C．takes off

D．takes down