It’s hard work to achieve a balance between schoolwork and hobbies.–So it is, but we have to.

In China, Chinese chess and table tennis are very popular among teenagers, many of _____ have been playing them since they were very young.

The old should _____ well.

ive professional hands ______ them next month, these students are sure to complete the experiment on time.

下列英语缩写与中文意思相符的一项是 ________ .