---_______ is the population of your hometown, Lucy?---It’s about 15,000.
Thanks to the 2014 Winter Olympics, Sochi is well-known,_______?
---- ____________?---- Sorry, we’ll go and play in the park.
The safety of food has become one of the _________ problems in our daily life.
We are supposed to ___________a solution to stop people from looking down at their mobile phones while driving cars.
The left-behind kids(留守儿童)can’t see their parents_________ the parents come back home from work.