If he ________tennis yesterday, he ________tired now.
A.didn’t play – wouldn’t have been
B.had played – wouldn’t have been
C.didn’t play – wouldn’t be
D.hadn’t played – wouldn’t be

Don’t be so childish. It’s time you ________up.
A.did
B.went
C.grew
D.brought

No charge will be made if you cancel within 10 days. But cancellations ____ in writing.
A.will make
B.must be made
C.must make
D.can make

Scientists agree that the world's climate ____ warmer over the past 50 years, but they disagree about the causes.
A.is becoming
B.becomes
C.became
D.has become

To end or greatly reduce pollution ____, people would have to stop using many things that benefit them.
A.constantly
B.suddenly
C.immediately
D.directly

_________ I ask Martha for a date and she laughs at me?
A.What should
B.What if
C.What would
D.As if

A.shout
B.plough
C.about
D.thought

A.hour
B.host
C.honest
D.honor

A.different
B.important
C.attractive
D.profession

Computers are ________used in schools and universities.
A.widely
B.wide
C.widen
D.width