用括号内所给动词的正确形式填空（共5小题；每小题1分。满分5分）
【小题1】—I hear that Sam has gone to Beijing for his holiday.
—Oh, how nice! Do you know when he left (leave)?
【小题2】—What’s wrong with my puter, Jim?
—Let me see. Oh, it has broken (break) down. You’d better ask Mr. Li to mend it.
【小题3】The reporter said that the UFO was traveling (travel) from east to west when he saw it.
【小题4】Look! The teenagers are making cards to show (show) love for their mothers.
【小题5】－That important problem has been discussed (discuss) for nearly two weeks.
－Yes, it’s hard for us to solve it.
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解析：
【小题1】此题考查动词的过去式。
【小题2】此题考查动词的现在完成时的基本构成，have/has+过去分词
【小题3】此题考查动词的过去进行时的基本用法。
【小题4】此题考查动词不定式做目的状语。
【小题5】此题考查现在完成时的被动语态。Have、has+been+过去分词。