These diagrams are especially helpful when we have a concrete problem ______ at hand.
— Are you still thinking about the gift Tony gave you yesterday? — Oh,to tell the truth, that’s makes me feel excited.
He couldn’t have his son ________telling him any lies.
No driving after drinking is a rule that every driver _______ obey in our country.
It was a nice meal, _______a little expensive.
It ’s well-known that ________ information is very important to businessmen.