When he saw a wallet on the ground, he ________at once.
It is difficult _____ baby pandas _____ live alone in the wild.
It is winter now. The weather in Nanjing is becoming .
We call her Xi Wang. What is the sentence structure?
I always go to Mochou Lake Park at weekends and enjoy ___________ there.
There was a lot of traffic on the way, so it ________ us about three hours to get there.