20. It is what and how much you eat and how much physical activity you do during the day__________ determines whether you gain, lose or keep your weight.
A. when B. how C. which D. that
19. I __________ all hope, but by giving myself one last chance I found victory in my efforts.
A. have given up B. gave up C. had given up D. give up
18. Wildlife in the Amazon forests ___________ be very dangerous, so you have to be extremely careful.
A. would B. can C. could D. should
17. __________ in the traffic jam, he was likely to be late for the job interview.
A. Being stuck B. Having stuck C. Stuck D. Sticking
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