until   

       B.

while 

       B.

because

       D.

though

02.

Their economy has expanded enormously, _________ ours, by contrast, has declined.

A.

while 

       B.

unless

       B.

in case       

  D.

which

03.

Could you watch my bags for me, _________ I go to the toilet?

A.

though

       B.

unless

       B.

what  

        D.

while

04.

The professor is typing his own letters _________ his secretary is ill.

A.

what  

       B.

which

       B.

if

              D.

while

05.

She said she was going to the shops and sked me whether I wanted anything _________ she was out.

A.

though

       B.

while 

       B.

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