They stayed for hours, ______ my mother was very annoyed about.
A.that
B.which
C.this
D.whom

______ English fluently, we should practice speaking it whenever possible.
A.In order to speak
B.In order speak
C.their accepting
D.they accept

As a general rule, the standard of living ______ by the average output of each person in society.
A.fixed
B.has fixed
C.is fixed
D.fixes

The stolen painting was ______ a large sum of money.
A.worth
B.valued
C.cost
D.priced

The greater the demand, ______ the price.
A.the highest
B.the high
C.higher
D.the higher

A.combine
B.collect
C.commerce
D.correct

A.club
B.subtle
C.climb
D.doubt

A.committee
B.referee
C.employee
D.refugee

A.appetite
B.architect
C.appreciate
D.arable

A.insight
B.chemist
C.dependent
D.substance