Scientists have discovered a close _____ between smoking and several serious diseases.
A.connection
B.union
C.action
D.combination

If I were you, I would regard their offer with considerable _____, because it seems too good to be true.
A.doubt
B.reservation
C.disbelief
D.suspicion

John pretended _____ sick yesterday.
A.have been
B.to be
C.to have been
D.being

He got an excellent grade in his examination _____ the fact that he had not worked particularly hard.
A.in spite of
B.although
C.on account of
D.because of

He was looked _____ by others because of his poverty.
A.out for
B.into
C.down upon
D.up to

“How long is the flight?”-“______ knowledge, it takes about 3 hours”.
A.In best of my
B.To my best
C.In my best
D.That's right

Mary _____ lazy preparing her lesson last night.
A.should be
B.shouldn't be
C.should have been
D.shouldn't have been

This ring is made of plastic so it's not valuable.
A.worthless
B.invaluable
C.priceless
D.worthy

Don't forget to come to my party tomorrow -"_____"
A.I haven't
B.I won't
C.I can't
D.I don't

You can come to the dance ______ you dress.
A.whatever
B.whether
C.however
D.whichever