他们打算去公园做运动，因为那里有大量的树，空气清新。They are going to do sports in the park because there are trees and the air is fresh.

Washington DC is the US.

My parents want me to be a doctor, but I'm not that.

There is a pen on the floor. Can you ?

Nelly likes music and she is piano.

Some students the danger of swimming in rivers.

→(adj. ) 有挑战性的

What are you going to be when you ?

Many teenagers the scientists like Yuan Longping.

Simon, in public places.