单项选择题

Teaching students of threshold level is hard but the effort is very______ to all of us.

A．significant
B．rewarding
C．repayable
D．hardy
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单项选择题
Watching me pulling the calf awkwardly to the barn, the Irish milkmaid fought hard to______ her laughter.
A．hold back
B．hold on
C．hold out
D．hold up
单项选择题
Because of the fuel shortage in the world, it is necessary for everyone to______ gasoline.
A．subscribe
B．conserve
C．forsake
D．blaze
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