Complete the sentences with the words from the box. at (3), in (2), of, out, on (2), with 1) Please don't laugh ... him. I feel sorry for him. 2) The room was full ... children's happy laughter. 3) Young children must travel ... the back of the car. 4) Jack had a big family. ... fact he had six sisters and brothers. 5) I'm so proud of you: you've done all the work ... your own. 6) We were surprised ... the new school rules. 7) Sue couldn't see us because she was standing ... her back to us. 8) The film was so fun-ny that I laughed ... loud. 9) A backpack is a backpack because you carry it ... your back. 10) John was very tall and usually sat ... the back of the classroom.