____ 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
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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
____ the boss for a raise didn't do any good, so I am thinking of a shift to another company.
Ask
B. Asked
C. My asking
D. I asking