—What’s your plan for this winter vacation?—I’ll take an express train to Shanghai for my holiday ___________ school ends.

. It is only when you nearly lose someone ____________ you fully realize how much you value him.

Some college students are seen doing_____ work they can find to support themselves.

Have you heard of the case____ a child accused his paeents of being ill-treated?

________, I could not memorize the text.