按要求写出下列单词的其他形式。 1. big (反义词) 3. too (同音词) 5. black (反义词) 7. down (反义词) 9. leaf (名词复数) 2. one (序数词) 4. do not (缩写) 6. three (序数词) 8. nine (序数词) 10. hot (反义词)
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【单选题】He told us not __ sad,and that it would be better for everyone to keep calm.