题型:填空题 按要求写单词。1. activity (复数) __________________2. sheep (单数) __________________3. down (反义词) __________________4. calf (复数) __________________5. let's (原形) __________________6. children (单数) __________________7. play (三单) __________________8. joey (复数) __________________9. baby cats (同义词) __________________10. that (复数) __________________ 查看答案