根据句子意思，用所给的正确形式填空。 1. ________ is very important. (healthy) 2. The ________ month of a year is February. (two) 3. We must clean our hands before ________ meals. (have) 4. He asked ________ to write down ________ names. (they) 5. What size are your son's ________ (foot) ? 6. Amy loves ________ (swim) and she is ________ (fun). 7. This is Sandy. Her ________ name is Shanshan. (China) 8. How many ________ can you see in the tree? (monkey) 9. It's not cold here in spring so it is ________. (warm) 10._______ is my favourite sport. (fish)