________ Chai Jing said in her video about the smog has caused public concern.

What color is your schoolbag —It’s ______.

untry has already sent up threeunmanned spacecraft , the most recent at the endof last March.

Thevisitors here are greatly impressed by the fact that_______ people from allwalks of life are working hard for_____ new Jiangsu.

147. — How long have you _____ friends— Five years. I made friends with himwhen we studied together in Beijing Institute of Technology.