选择合适的词填空

1. The boy was         ( surprise; surprised) when he saw the alien.

2. Leila,please         ( get out ; get out of) the shower quickly.I want to use it.

3.          ( Because; While) I was walking down the street,I saw a stranger.

4. —What's up?  

    —Did you see the UFO? When it         (landed; was landing) ,I was in the barber shop.

5. What was the robot doing          ( while; when) the fire started?

6. He sits         (in front of;in the front of) me.