9. The line was busy. Someone _______ the telephone.

A. must be using                                     

B. must use

C. must have been using                          

D. should have been using

10. The boss urged his workers _______.

A. away                                                 

B. off

C. up                                                     

D. on

11. I know you will not let me _______.

A. in                                                      

B. up

C. down                                                  

D. out

12. Occasionally she and her husband _______ ride into the country for a picnic.

 A. could                                                 

B. must

C. would                                                 

D. should

13. If you buy two books, you’ll get another one _______

A. thrown away                                       

B. thrown off

C. thrown up                                           

D. thrown in

14. As _______ health, I have nothing useful to say as I have little experience of illness.

A. regards                                               

B. regard

C. regardless                                           

D. regarding

15. The total effect of Edison’s career _____ the sum of all of his inventions.

A. excels                                                 

B. succeeds

C. affects                                               

D. surpasses