单项选择题
He has never seen the Greens and be knows ______ about ...
单项选择题He has never seen the Greens and be knows ______ about them.
It is necessary that anyone ______ exercises every day ...
单项选择题It is necessary that anyone ______ exercises every day if he wishes to keep healthy.
--Which subject do you like ______ --I like chemistry ...
单项选择题--Which subject do you like ______ --I like chemistry ______ than any other one.
