单项选择题
It is necessary that anyone ______ exercises every day if he wishes to keep healthy.
单项选择题 I cannot sleep. The dog next door is making too much noise. I wish it ______ quiet.
单项选择题 He has never seen the Greens and he knows ______ about them.
单项选择题 If motorists had to pay an extra tax to drive in cities, they ______ their cars a lot less.
