D. once

　　15. (2017·南平模拟) 　e-commerce worries some merchants, it contributes to the development of delivery industries.

　　A. When B. Unless

　　C. While

　　D. Until

　　16. He is welcome to come along, 　he behaves himself.

　　A. provided that B. so far as

　　C. even if

　　D. in case

　　17. Steps must be taken　this kind of disaster will never happen again.

　　A. because B. even if

　　C. so that

　　D. as

　　18. You had better book rooms at the hotel in advance　you should find no room on your arrival.

　　A. so that B. even if

　　C. in case

　　D. now that

　　19. 　I have got a car, I don’t get as much exercise as I used to.

　　A. So long as B. Even if

　　C. Now that

　　D. In case

　　20. (2017·宁波模拟) All the novels in the list, 　otherwise stated, are all available in this library.

　　A. as B. if

　　C. although

　　D. unless

　　21. (2017·榆林模拟) Don’t serve water at mealssomeone asks for it.

　　A. if B. while

　　C. unless

　　D. since

　　22. She was about to dish upsome guests came.

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