Until he spoke I hadn't realized he didn't know anything about the subject.
A.If he didn't speak, I wouldn't realize he didn't know anything about the subject.
B.If he hadn't spoken, I wouldn't have realized he didn't know anything about the subject.
C.Unless he spoke I wouldn't realize he didn't know anything about the subject.
D.When he spoke I hadn't realized he didn't know anything about the subject

As soon as they arrived at the beach, it started to rain.
A.They had no sooner arrived at the beach, it started to rain.
B.No sooner had they arrived at the beach than it started to rain.
C.They had hardly arrived at the beach, it started to rain.
D.It started to rain when arriving at the beach.

You needn't hurry because there is a delay of about two hours.
A.There is a delay of about two hours and therefore you mustn't hurry.
B.It is not necessary for you to hurry because there is a delay of about two hours.
C.It is not possible for you to hurry because there is a delay of about two hours.
D.You mustn't hurry because there is a delay of about two hours.

Viruses are organisms that are much smaller than bacteria and about which very little is known.
A.Not much is known about viruses, which are much smaller organisms than bacteria.
B.Very little is known about viruses or bacteria except that they are very small organisms.
C.Not much is known about bacteria, but they are much larger organisms than viruses.
D.Very little is known about bacteria, but viruses are much larger than they are.

I expect the new trend will soon ____ here.
A.take up
B.catch up
C.catch on
D.identify with

The Continental United States is ________ that there are four time zones.
A.so a big area
B.very big
C.much big
D.so big an area

.................beautiful flowers!
A.What a
B.What
C.How
D.So

A.laugh
B.plough
C.enough
D.cough

He has little spare time
A.free
B.occupied
C.busy
D.filled

How excellent the girl is !
A.What the excellent girl !
B.What an excellent girl !
C.What about an excellent girl !
D.What for an excellent girl !