They used to work as doctors, ______?
A.didn't they
B.weren't they
C.did they
D.don't they

You enjoy watching football, ________?
A.do you
B.do not you
C.don't you
D.aren't you

You had a bad cold last night, ________?
A.hadn't you
B.didn't you
C.wouldn't you
D.weren't you

You are not hungry, ________?
A.are you
B.do you
C.don't you
D.aren't you

No one is better at cooking than his mother, ____?
A.are they
B.is she
C.isn’t she
D.aren’t they

You did not do your homework, ________?
A. are you
B.did you
C.didn't you
D.will you

Not until 1911.... .
A.identified the first of the vitamins
B.the first of the vitamins identified
C.was the first of the vitamins identified
D.the first of the vitamins was identified

Only after the film started.... that.... it before.
A.I realized / I had seen
B. did I realize /I had seen
C.I realized / had I seen
D.did I realize / had I seen

Seldom cactus plants are (A) found (B) outside (C) of (D) North America.
A.cactus plants are
B.found
C.outside
D.of

No sooner had (A) the secretary hang (B) up than (C) the phone rang again (D).
A.had
B.hang
C.than
D.again