A.was playing
B.had played
C.played
D.is playing

A.result in
B.hold on
C.take over
D.keep to

A.is he
B.does he
C.isn't he
D.doesn't he

A.knowledgeably
B.knowledgeable
C.knowledge
D.know

A.light-hearted
B.big-hearted
C.warm-hearted
D.whole-hearted

A.As soon as it stops raining
B.After it had stopped raining
C.When it stopped raining
D.Once it stopped raining

A.mood
B.luck
C.fortune
D.merit

A.ABDeF.
B.aBDeF.
C.AbDEF .
D.ABDef.

A.Thể ba.
B.Thể bốn.
C.Thể tứ bội.
D.Thể không.

A.Nguyên sinh.
B.Tân sinh.
C.Trung sinh.
D.Cổ sinh.