If it had not been for your help, I ____ the examination.

—I paid 200 dollars for the necklace. I think it's much too expensive.—Expensive? I don't agree with you. You so before you _______ it.

He ______ have finished his work; otherwise, he wouldn’t be enjoying himself by the seaside.

—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．

--Where have you been? --I_____in the heavy traffic. Otherwise I_____ here earlier.