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.Chất lỏng trong các ống giữ nguyên (không dâng thêm).
B.Khác nhau.
C.Hạ xuống dưới nắp bình.
D.Như nhau.

A.\(36cm\)
B.\(12\,cm\)
C.\(24\,cm\)
D.\(18\,cm\)

A.\(24c{m^2}\)
B.\(16c{m^2}\)
C.\(20cm\)
D.\(16cm\)