He offered to drive me to the airport, I felt so grateful.
Facts prove that the world’s economic development is not a win-lose game but one in which all ________ be winners.
When we lived in that village, we ________ often play together in the river there.
—Isn’t that your boss over there? —No, it ________ be him. I’m sure he is in the office now.
How ________ you say that you really understand the whole text if you have covered only part of it?
—Many houses near the airport were destroyed by the wind. —Well, the wind ________ have been very strong.