—I saw your uncle take a taxi to the airport．Why didn’t you drive him there?—I    ,but my car    ．

The people from all over the world demand that reforms______.

—Do you know where David is? I couldn’t find him anywhere.—Well. He _________have gone far—his coat’s still here. 

—What are you doing, John? Why stop?—To be on the safe side, we’d fill up the car now for we _______ run out of gas on the way．

 "You know so much about literature. It's a pity you failed your degree," Harry said, "You ______ a good teacher."