Tim's parents ______ happy when knowing his poor academic results at school.
A.mustn't have been
B.needn't have been
C.shouldn't have been
D.can't have been

Margaret would prefer ______ books rather than see their screen adaptations.
A.to read
B.reading
C.read
D.having read

I _______ the living room by the time Dad comes home. He will be surprised.
A.will paint
B.am painting
C.have painted
D.will have painted

When______ is not known.
A.it was invented the wheel
B.the wheel was invented
C.the invention of the wheel
D.was the wheel invented

They asked me a lot of questions, ______I couldn’t answer.
A.all of which
B.that
C.all of whom
D.who

This one is prettier, but it costs ______as the other one.
A.twice as many
B.as many
C.twice as much
D.so much

______electricity you use,_____ your bill will be.
A.The most - the higher
B.The more - the high
C.More - higher
D.The more - the higher

On September 9, 1850, California was admitted to the Union______
A.being thirty-first state
B.as the thirty-first state
C.for the thirty-first state
D.the thirty-first state

Relative humidity is the amount of water vapor the air contains at a certaintemperature______ with the amount it could hold at that temperature.
A.to compare
B.compared
C.comparing
D.compares

“You missed a good chance in your career." “Yes, I ______that job when Mr. Johnson offered.”
A.shall take
B.shall have taken
C.should take
D.should have taken