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第一节：单项选择 从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。 21. ______both sides accept the agreement will a lasting peace be established in this region. A.If only B.Unless C.Only if D.As long as 22. His failure at ______ first attempt didn‘t disappoint him. Instead he gathered his courage and tried ______ second time. A.the; the B.the; a C.a; the D.a; a 23. The doctor ______ the patient with great care and said there was nothing wrong with him. A.examined B.attended C.tested D.checked 24.Up till now full use of this theory has been ________ in building large ocean-going ships. A. done B. made C. laid D. taken 25.---I was trying to carry out the plan but I failed. ---Well you _________ for we were uncertain it would do ________. A. needn’t do that in fact B. needn’t have done in effect C. needn’t have in practice D. needn’t in time 26.All the essays _____________ the teacher sent the students home. A. having written and collected B. having been written and collected C. being written and collected D. to be written and collected 27.---Mike must have known that. ---No he ________. How _______ he? | 
