13. ________ not to make mistakes, type slowly and carefully.
A. So B. In order C. So that D. To
14. Would you mind ________ the phone for me?
A. to answer B. answer C. answering D. please answer
15. The polluted chemical waste was dumped into the ocean; _____________, the mass of fish died.
A. because B. as C. because of D. consequently
16. What _________ you do if you were President?
A. would B. will C. do D. did
17. Before the meeting finished, they had arranged when __________ next.
A. they met B. they to meet C. to meet D. meeting
18. From 1865 to 1875, a remarkable __________ of inventions was produced.
A. diversity B. mixture C. variety D. collection
19. Surely Andrew ___________ in fairies for long enough. Lets tell him the truth.
A. believes B. is believing C. has believed D. will believe
20. My brother had never been abroad ___________ he joined the army.
A. since B. until C. during D. whil
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