Two kids with helmets on sitting outside while one looks down and the other straight ahead .
It is certain that the kids put down their pens and hand in their tests papers to the teacher .
It is impossible that the kids put down their pens and hand in their tests papers to the teacher .
It is certain that the kids put down their pens and hand in their tests papers to the teacher .
The kids put down their pens and hand in their tests papers to the teacher .