找出下面各句中的错误，并改正。
1. Tom is going study French. __________
2. The children are playing the football in the park. __________
3. He was born on China.   __________
4. Yang Liwei went in a spaceship but made a video. __________
5. The ducks saw the picnic and eat it. __________

What’s _____ the classroom?  （  ）

A．in

B．under

C．at

Ms Jin is a teacher a primary school. ( )

A．at

B．in

C．on

I'm going to swim______ the sea. （）

A．on

B．in

C．under

D．of

Now they are ______ the top of the mountain. (   )

A．in

B．on

C．at