A.
B.
C.
D.

A.
B.
C.
D.

A.participate
B.to participating
C.participating
D.to participate

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

A.about
B.on
C.for
D.at

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