I ___ a cup of tea before I left for my office

Question 17. I ___________ a cup of tea before I left for my office.
A. have
B. had had
C. have had
D. will have
Question 18. Global warming ________ if there weren't too much carbon dioxide in the atmosphere.
A. wouldn’t happen
B. didn’t happen
C. won’t happen
D. happened
Question 19. The tornado caused a massive ________ to the town.
A. destruction
B. extension
C. danger
D. mishap
Question 20. “I'll give you your money back tomorrow.”
A. She promised to give me back your money the next day.
B. She promised me to give the money back the next day.
C. She promised to give me back the money the next day.
D. She promised to give you back your money the next day.
Question 21. Hemp was grown throughout history ________ its versatility; it can be used to make many different things.
A. as a result
B. because
C. since
D. due to