（2010四川省成都市35. 1）I wont be able to understand what you say,_______you speak too quickly.
A.if B.though C.because
（2010浙江省湖州市，22，1）-Is everyone here today?
--No.Tom is at home_____he has got a bad cold.
A.because B.if C.until D.unless
（2010山西省，27，1）In summer , food goes bad easily ________ it is put in the refrigerator.
A. until B. if C. unless
（2010河南省，25，1）( ) its difficult to make her dream come true，she never gives up
A Though B Unless C Because D If
（2010山东省莱芜市，27，1）--I hear Jack Chan will come to Laiwu next week.
--Really? _______ he comes, my younger sister will be very happy,
A．If B．Until C．Unless D．Before
（2010贵州省铜仁市，35，1）- May I go to the concert with you?
- Im afraid not ____ you have a ticket, because I have only one.
A. since B. if C. unless D. though
（2010山东省菏泽市，27，1）Mary spends a lot of money on clothes _______ her family is not rich.
A. because B. though C. if D. so
答案：CACAACB