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use the solid does not move, _____. A. so does a liquid B. so a liquid does C. as does a liquid D. so is a liquid 11. Much _______the young couple needed money to make the down payment for the apartment, they wouldn’t ask their parents for help. A. although B. as C. even if D. while 12. I have kept the photo____ I can always see it, as it reminds me of the days when I studied in Britain. A. at which B. when C. where D. at the place 13. _____ your essay carefully before you hand it in, some mistakes can surely be avoided, I think. A. Having checked B. Check C. As long as you check D. While checking 14. I would appreciate it ______you can help me with my English this afternoon. A. because B. until C. when D. if 15. _____ he has limited technical knowledge, the old worker has a lot of experience. A. Since B. Unless C. As D. Although 16. _____ you’ve tried it, you can’t imagine how pleasant it is. A. Unless B. Because C. Although D. When 17. _________,Jack can never catch up with Tom in the study of English. A. However he tries hard B. No matter how hard he tries C. No matter how he tries hard D. As hard