czy moglby ktos to sprawdzic :)

nie wiem mam problem z takimi banalnymi zdaniami :
They are studing something AT SCIENCE LESSON / IN SCIENCE LESSON.
They are all BY CLASSROOM/ IN A CLASROOM.
They WILL BE in 16 years old.
They are wearing casula clothes.

1. They are studying something at their science lesson.

2. They are all in a classroom.

3. They will be 16 years old.

4. They are wearing casual clothes.

=) Pozdrawiam