87. Only when you passed the test requires________你才能申请驾照

　　88. Working mother today feel it difficult ______________保持事业和家庭之间的平衡

　　89. we ______________本来可以避免这个愚蠢的错误，but we did not follow his advice.

　　90. He is well into thirties, it is about time he_______________安顿下来，开创一番事业

　　91. If you_______________发现自己在排队等候，at a supermarket checkout counter, are you likely to get impatient.

　　答案及解析

　　87. could you apply for the driving license

　　本题考查：only置于句首引起谓语动词部分倒装;

　　88.to keep the balance between career and family

　　本题考查：动词不定式做形式宾语。

　　89.should have avoided such a stupid mistake

　　本题考查：虚拟语气的用法，should have done 译为“本应该”

　　90. settled down to build a business或should settle down to build /launch a business/career.

　　本题考查：it is about time that 后接虚拟语气。句式结构it is about time that从句，从句谓语动词用过去式或should+动词原形

　　91. find yourself waiting in line

　　本题考查：if引导的真实条件句与反身代词