Steve and Jane are both very good ____ chemistry.
It was______ she went back home______ Kate realised she had left her schoolbag at school.
—What are you busy with? —The sports meeting ______ in our school next week.
China is embarrassed by such a fact: Chinese visitors______ rubbish on the Great Wall, followed by a foreigner picking up the litter.
As a well-known Chinese saying goes, “If you want to be rich, you______ first build roads.”
“Run away from Beijing, Shanghai, and Guangzhou” has been a slogan for some of China’s younger generation______ are under unbearable economic pressure to survive in cities.