There are over 2,000 varieties of snake______ are harmless to humans.
A.most of them
B.mostly they
C.most of which
D.which most

Choose the word that has main stress placed differently from the others.
A.encourage
B.cultivation
C.discourage
D.responsible

To _____ it may concern.
A.who
B.which
C.that
D.whom

It was the kind of accident for ______ nobody was really to blame.
A.which
B.whom
C.that
D.who

The woman about ______ I am telling you teaches me English.
A.who
B.that
C.whom
D.which

Pioneers, ______ in isolated areas of the United States, were almost totally self-sufficient.
A.that I lived
B.lived
C.living
D.who living

______ in large quantities in the Middle East, oil became known as black gold because of the large profit it brought.
A.Which was discovered
B.Discovering
C.That when discovered
D.Discovered

Lady Astor was the first woman ______ her seat in Parliament.
A.who takes
B.take
C.taking
D.to take

We could make better ______ of our energy resources.
A.use
B.spend
C.need
D.limit

The government should do more to protect rare animals from being ______.
A.extinctions
B.extinct
C.extinctive
D.extinction