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

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

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

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

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

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

A.Was built
B.Building C. To have built D. Built
C.
D.

A.destruction
B.assessment C. improvement D. pollution
C.
D.

A.harmful consequences
B.effective techniquesC. latest developments D. useful experiments
C.
D.

A.There’s no doubt about that.
B.It doesn’t matter at all.
C.It is very kind of you to say so.
D.I am sorry to hear that.