青少年们应该从小被教育保护环境。Teenagers to protect the environment from an early age.

王奶奶住院时，我妈妈经常照看她。（take）

新冠肺炎疫情期间，劝告大家要尽可能少聚集。（as）

Chinese people show more interest in space recently.

In order to keep healthy, my father decided to .

go out for a walk?

After exercising for some time, she's much before.

He and caught up with others finally.

We exams now.

The teacher told the boy not too much time games.

→(adj. ) 有挑战性的