A.The athletes might have practiced hard for the games.
B.The athletes must have practiced hard for the games.
C.The athletes should have practiced hard for the games.
D.The athletes couldn't have practiced hard for the games.

A.In
B.polite
C.had stood up
D.entered

A.In
B.polite
C.had stood up
D.entered

A.enjoy
B.coaster ride
C.the most terrifying
D.of their

A.were working
B.the teacher
C.around
D.peering

A.the reason and the way of catching colds
B.the common cold during the two World Wars
C.the experiments on the common cold
D.the continued spread of common colds

A.the reason and the way of catching colds
B.the common cold during the two World Wars
C.the experiments on the common cold
D.the continued spread of common colds

A.epidemics
B.disbelief
C.illness
D.misconception

A.The Eskimos do not suffer from colds all the time.
B.A person may catch a cold by touching someone who already has one.
C.Colds are not caused by cold.
D.People suffer from colds just because they like to stay indoors.

A.Duyên hải Nam Trung Bộ.
B.Đồng bằng sông Hồng.
C.Bắc Trung Bộ.
D.Đồng bằng sông Cửu Long.