当我们看到长江里的江豚时是多么兴奋啊！ (excited) we were when we saw finless porpoises in the Yangtze River!

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.

the night is, the daylight will come in the end.

Teenagers should learn to be their behaviors.

→(adj. ) 有挑战性的