There is no point advocating banning smoking in public ________ the law is introduceD.",

A.when

B.unless

C.since

D.because

It is hard for the Greek gove ment to get over the present difficulties ______ it gets more financial support from the European Union.",

A.if

B.unless

C.because

D.since

It is difficult for us to lea a lesson in life ________ we've actually had that lesson.",

A.until

B.after

C.since

D.when

Small sailboats can easily tu over in the water ______they are not managed carefully. ",

A.though

B.before

C.until

D.if

_______ your diet, it is easy to reduce.",

A.Watching

B.To be watching

C.If you watch

D.To have watched

The WTO cannot live up to its name __________ it does not include a country that is home to one fifth of mankinD.",

A.as long as

B.while

C.if

D.even though

Thestudents________haveasportsmeetingthisweekendifit________.",

A.won’t;rains

B.will;rains

C.won’t;willrain

D.aregoingto;isgoingtorain

A small car is big enough for a family of three______you need more space for baggage.",

A.once

B.because

C.if

D.unless

You must keep on working in the evening, ______you are sure you can finish the task in time.",

A.as

B.if

C.when

D.unless

Don't tu off the computer before closing all programs, ________ you could have problems.",

A.or

B.and

C.but

D.so