over before you act.

　　A．at all B．at hand

　　C．at once D．at random

　　13．－John went to the hospital alone.

　　－If he________me about it，I would have gone with him.

　　A．should tell B．tells

　　C．told D．had told

　　14．When his mother had him________his homework，he had the light________all night to pretend he was working hard.

　　A．do；burning B．to do；burning

　　C．do；burn D．to do；burnt

　　15．(2012·浙江高考)Had they known what was coming next，they ________ second thoughts.

　　A．may have B．could have

　　C．must have had D．might have had

　　Ⅲ.阅读理解

　　A

　　There are various reasons why cancers appear to be on the increase.For one thing，though their sufferers are to be found in all age groups，cancers are particularly likely to attack persons in their middle and advanced years.Naturally，since people live longer these years，there are more cancer sufferers than before.Again，with better methods of diagnosis(诊断)，doctors can more easily recognize cancerous growths that would formerly have passed unnoticed or that would have been wrongly diagnosed.It is also believed that certain habits and conditions of modern living，including heavy smoking and the pollution of the air，may leave people living in more cancer­causing conditions than before.

　　We all look forward to the day when a simple medical test can find cancer when it is still small.Researchers around the world are working on such_a_test.Most of their work deals with the examination of the blood.

Researchers in Boston have found something in the blood of cancer patients that does not appear in healthy persons.The test showed which persons had cancer and