请填写出下列英语谜语的答案。 1. What room can no one enter? 2. What fruit is never found singly? 3. What has a neck but no throat? 4. What kind of dog never bite? 5. What word can you make shorter by adding to it? 6. Neither a plane nor a bird am I , though you will see me in the sky, full of water, yet not the sea or a river, what can I be ? 7. It wasn’t my sister, nor my brother, but still was the child of my father and mother. Who was it? 8. I am something that is full of holes and yet can hold water. What am I?