题目内容

____ any area receives more water than the ground can absorb, the excess water flows to the lowest level, carrying loose material.

A. Being
B. Whenever
C. When might
D. Is

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____ people depend to such a great extent on forests, every effort must be made to preserve trees and wildlife.

A. For
B. Since
C. Before
D. Because

She, we believe, burnt her midnight oil for the whole week, ____ she got very good marks for all her subjects.

A. for
B. because
C. since
D. as

I happened to be walking in my garden ____ I noticed a huge number of snails taking a stroll on some of my prize plants.

A. when
B. while
C. until
D. through

I always keep candles in the house ____ there is a power cut.

A. if
B. in case
C. on condition that
D. when

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