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10. —What do you have to do tomorrow?
— I'll have to ________ in a conference.
A. join B. taking part C. attend D. participate
11. Modern technological advances are being made, but ________.
A. with highly considerable expense
B. at a great expense
C. with great expense involved
D. by a lot of expense
12. — Why didn't you go to the lecture yesterday evening?
— ________, I changed my mind.
A. On a second thought B. By the second thought
C. On second thoughts D. By secondthoughts
13. ________ one time, Manchester was the home of the most productive cotton mills in the world.
A. On B. By C. To D. At
14. — Wasn't the issue settled?
— No, the two sides are still ________ conflict.
A. in B. during C. on D. with
15. — How do you like these articles?
— They are not much ________ demand now.
A. on B. in C. at D. for
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