Everyone will go through life's stages of ups and downs, ________ selfrespect plays a key role in the maturity(成熟) of a person.
Apples are usually sold by ________ weight and eggs are sometimes sold by ________ dozen.
.---Will someone go and get Mr. Black?---He’s already been ___.
__ with such great difficulty, Jack felt at a loss ___.
—Sir, I’d like to take a week’s holiday. —____. We’ re too busy now.
—He looks very happy. He ____have passed the exam, —I guess so. It’s not difficult after all.