On September 22, more than 150 Chinese cities, including Beijing, observed world Car Free Day to low-carbon travel.
. The year 2003 ____ a wild spread of SARS, a disease people knew little about at that time.
The company turned a deaf ear to the workers’ _____ about their pay and working conditions.
Today’s world is changing rapidly, making _____ necessary for us to continue learning otherwise we can’t keep up with the time.
. ---- It’s a secret _____ you and me.
I think going swimming in my spare time, _____ I think is great fun and good exercise as well as a useful skill.