Shenzhen is a beautiful city. — Yes. You can see a lot of flowers and trees on ________ of the streets .

To enjoy the view on the way, Mary would rather spend long hours on the traintravel by air.

Mr. Smith has bought a large house a swimming pool.[ ]

Please turn _____ the light when you leave the room.[ ]

He kissed his wife and then ______ goodbye _____ her when he left home.