C. which                                                 D. who

15. Alex works harder than ________ in the office.

A. everyone else                                       B. anyone else

C. everyone                                             D. anyone

16. ________ your decision to place regular orders with us, we request that you furnish us with two references for the initial purchase.

A. While appreciating                                B. As appreciating

C. When appreciate                                   D. Because we appreciate

17. If there were fewer management staff, more work ________ .

A. would be done                                     B. will be done

C. have to be done                                           D. should be done

18. No one made more profit in that transaction than ________ .

A. her                                                      B. them

C. he                                                       D. him

19. Because of air pollution being greatly reduced, this city is still ________ .