We can have ________ bluer sky if we create _________less polluted world.

_______ a chance, we will visitEdinburgh a second time

Please don’t tell anybody—I I promise

＿＿＿＿you ＿＿＿＿ the editor at the airport?—— No, he ＿＿＿＿ away before my arrival

Where have you been? —I got caught in the traffic jam; ______ I’m here just on time