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12. A. Since the substance is very toxic, so protective clothing must be worn at all times.
13. B. uninteresting as the film was, he tried to watch the whole film.
14. C. Despite her old age, she looked very grateful.
15. B. Because she wanted her children to come to school on time, she gets up early to prepare breakfast.
16. D. I lowered my voice in order that our conseration couldn't be heard.
17. B. However hard he tried, he didn't succeed.
18. A. Though Crazianna is a big country, it has never received respect from its neighbors.
19. B. The roads were slipppery but they managered to complete the race.
20. B. However cold it was, they decided to go for a picnic.
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