Exercise Ⅰ. 用if 或unless填空。 1. We won’t go to his party _____ he invites us.21·cn·jy·com 2. _____ I’m tired, I’ll have a rest. 3. I will lend you the money _____ you pay back on time. 4. _____ it snows tomorrow, we’ll have a day or two off.21cnjy.com 5. I won’t buy that wallet _____ it costs less than 100 yuan.2-1-c-n-j-y Ⅱ. 使用括号中词语的正确形式填空。 1. If you put paper into ?re, it _____ (burn).【来源：21cnj*y.co*m】 2. If John _____ (go) to the supermarket at 7 p.m., he can buy a lot of cheap food. 3. —Shall we go on a picnic this weekend? —Good idea! Unless it _____ (rain). 4. If I got good grades in junior high school, my parents_____ (take) me to travel. 5. We _____ (must) cross the road unless the light turns green.21世纪教育网版权所有 Ⅲ. 单项选择。 ( ) 1. The meeting didn't start _____ everyone was there.21教育网 A. because B. until C. why D. if ( ) 2. I won’t believe you _____ I have seen it with my own eyes.【来源：21·世纪·教育·网】 A. before B. unless C. after D. when ( ) 3. Tom will call me if he _____ Shanghai.【出处：21教育名师】 A. arrives B. will reach C. arrives in D. get to ( ) 4. I’m sure he’ll come to see me before he _____ Beijing.【版权所有：21教育】 A. will leave B. is leaving C. leave D. leaves ( ) 5. Betty didn’t go to see the ?lm yesterday _____ she was ill.21教育名师原创作品 A. because B. but C. until D. if ( ) 6. _____ something dramatic happens, we usually remember it well.2·1·c·n·j·y A. Though B. If C. Because D. Unless ( ) 7. I’d like to go swimming _____ the water is not too cold.21*cnjy*com A. for B. unless C. if D. whether ( ) 8. I want to know _____ she is going to see a ?lm. A. if B. that C. what D. which ( ) 9. I’ll go to see the ?lm with you _____ I have time this evening.21*cnjy*com A. whether B. so C. if D. when ( ) 10. _____ you study harder, you'll never pass the ?nal exam. A. If B. Until C. Unless D. Except Keys Ⅰ. 1. unless 2. If 3. if 4. If 5. unless Ⅱ. 1. will burn 2. goes 3. rains 4. will take 5. mustn’t21·世纪*教育网 Ⅲ. 1-5 ABCDA 6-10 ACACC
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