Some snakes are poisonous, ___ others are harmless.
A.despite
B.so
C.for
D.but

They left the room ___ they had finished their exam.
A.while
B.once
C.soon
D.during

The string ___ they tied the parcel up with was so weak that the parcel came to pieces when I got it.
A.as
B.because
C.what   
D. that

Some English words have the same pronunciation ___ they are spelled differently, for example, dear and deer.
A.unless
B.only if
C.since   
D.even though

Give her a telephone number to ring ___ she gets lost.
A.whether
B.perhaps
C.unless
D.in case

I’d rather have a room of my own, ___ small it may be.
A.even if
B.no matter
C.however
D.whatever

It is three weeks ___  I saw him last.
A.before
B.as
C.since   
D.when

___ many times I tell him, he always forgets to pass on phone messages.
A.wherever
B.whatever
C.however
D.whenever

I won’t enter the room until it ___ cleaned.
A.will have been clearly
B.has been properly
C.will be clearly
D.has properly

Lessy’s lost an awful lot of weight, hasn’t she? She ___ on a diet.
A.must go
B.must been
C.must have been
D.may go