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(2010 .河北省卷,42. 1) Peter likes reading a newspaper he is having breakfast. A. until B. while C. because D. though (2010.江苏省盐城市12. 1)Many students didnt realize the importance of study_____they left school. A.when B.until C.as D.after (2010.四川省内江市39. 1)I dont know if it______tomorrow.If it______,we wont go on a picnic. A.rains;rains B.will rain;rains C.will rain;will rain (2010山东省潍坊市29. 1)You have to leave now________you can catch the early bus. .A.so that B.as soon as C.because D.if (2010.浙江省衢州市23. 1) You should go over your test paper _____ you hand it in . A. before B. though C. because D. as soon as (2010.江苏省无锡市.12. 1)Scientists say it may be a few years ______it is possible to test the new medicine on patients. A.because B.after C.before D.since (2010年上海市37. 1)We will have no water to drink _______we dont protect the earth. A.until B.before C.though D.if （2010江苏省扬州市，，41）-Could we play football in your playground,Sir? --No,_______you have the principals note. A.if B.unless C.because D.since | 
