老师经常告诉学生遇到紧急情况要保持冷静。
The students are often told by teachers when facing emergencies.
So far,China has built nearly 600,000 cultural centers in . (村庄)
I promised Li Ming I would keep the secret to . (我自己)
Jack enjoys and sunbathing with his friends. (游泳)
There are many online libraries where you can read books for ________, such as the national Online libraries Library of China and Shanghai Library. (免费的)
The app about how to learn Chinese is very popular ________ the foreigners.(在……当中)