单项选择题

It is necessary that anyone ______ exercises every day if he wishes to keep healthy.

A．do
B．would do
C．did
D．will do
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单项选择题
shortly after tea Leopold heard the music from upstairs. He was astonished because ______.
A．Wolfgang loved the piece so much
B．Wolfgang was playing in the darkness
C．Marianne had never played the piece so beautifully
D．Marianne was washing dishes in the kitchen
单项选择题
Energy is obtained from rivers by ______.
A．building bridges across them
B．driving generators into them
C．building dams across them
D．directing them into homes and factories
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