_____ life exists on any other planet in the solar system still remains a question.
I got close enough to hear them speaking Chinese, and I said “Ni Hao ” just as I ____ do in China.
We are said to be living in ____ Information Age, ____ time of new discoveries and great changes.
Scientists study ____ human brains work to make computers.
I make $2,000 a week, 60 surely won’t make ______ difference to me.
He will come to understand your efforts sooner or later. It's just a matter of.