用所给词的正确形式填空。 1. It is interesting _________ (know) something about animals. 2. __________ (not open) the door. It is cold outside. 3. She can work out the difficult question _________ (easy) 4. Please keep ___________ (quietly) in the reading - room 5. —Where is my cup? —__________ (you) is over there. 6. What about _________ (go) fishing with us tomorrow?