I was halfway back to the cottage where my mother lived ________ Susan caught up with me．

A．though

B．until

C．when

D．while

By no means ________ look down upon the poor．

A．we would

B．should we

C．ought we

D．we shall

Is this research center ________ you saw the modern equipment last year?

A．which

B．that

C．the one that

D．the one where

According to ________ World Health Organization, Aids is not ________ only deadly disease discovered in Africa．

A．the; a

B．the; the

C．a; a

D．a; the

Mr．Johnson tried to get rid of the man who ________ him but in vain．

A．had followed

B．has followed

C．was following

D．would follow

－What a long walk it was!I was completely tired out．

－You ________ a taxi．

A．could take

B．could have taken

C．must have taken

D．should take

They will give the prize money to ________ pays enough attention to the protection of wild life．

A．who

B．anyone

C．whomever

D．whoever

Yesterday Jane walked away from the discussion Otherwise, she ________ something she would regret later．

A．had said

B．said

C．might say

D．might have said

It already 5 o’clock now．Don’t you think it’s time ________?

A．we are going home

B．we go home

C．we went home

D．we can go home

________ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home．

A．To wait

B．Have waited

C．Having waited

D．To have waited