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15. Before Sally left home, her mother kept telling her to ________ her manners at the party. A. notice B. care C. mind D. observe16. ________, you need to give all you have and try your best. A. Being a winner B. To be a winner C. Be a winner D. Having been a winner17. You can never be ________ when crossing the street. A. very careful B. too careful C. carefully enough D. enough careful18. It is usually warm in my hometown in March, but it ________ be rather cold sometimes. A. must B. can C. should D. would 19. More wild tigers have been seen in the forest around this area, ________ there used to be very few. A. when B. where C. what D. which 20. It is ten years since we ________ each other last time. A. see B. have seen C. saw D. had seen
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