It’s not until we know more about it _______ be able to improve the situation.
He was told that it would be at least three more months _____ he could recover and return to work.
-I'm sorry for what I said. -Forget it. I can't remember _____.
It is reported that the scientists in Europe are _____ all possible ways to control it.
-How do you deal with the disagreement between the company and the customers? -The key _____ the problem is to meet the demand _____ by the customers.
-Tom and Mary got married last month. -Are you kidding? They have _____ in common.