Can you describe a distinctive characteristic of this animal—Its neck can be extended ________ of its body

The letter is from my sister, ______is working in Beijing.

Zhongdian is 659 kilometers away from Kunming, and there are ______ flights between the two cities.[ ]

Sorry, Mom! I am late.–What a pity! Jenny here to see you. She should be on her way home now.

The murderer was brought in, with his hands behind his back.