Edison asked his father why the hens could hatch eggs ___he couldn’t.
He just stared at me and there was an expression in his eyes that I couldn’t.
When I got off the crowded bus, I found my pocket _____ and the disk in it with the important documents gone.
We can never expect ____ bluer sky unless we create _____ less polluted world.
The newly discovered star was named ___a Chinese astronomer ____ honor of his contributions to astronomy.
-----Good morning, Xueyuan Hotel. -----Hello, I’d like to book a room for the nights of the 14th and 15th. -----_______.