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&rsquo