Use the prepositions in, for, on, to, of, at where necessary. 1) she is never late school/ 2) we don't have computer-surfing our timetable. 3) they do a lot of sums class. 4) i don't like to sit the desk in front the teather. 5) i'm happy we have sport 4 times week. 6) the browns are leaving moscow paris monday. 7) my sister must go bed at 9 o'clock. she is five years old/ заранее !