Use the preposterous in,for,on,of,at where necessary._1)she is never late . 2)we don't have computer -surfing timetable. 3)they do a lot of sums . 4)i don't like to desk in the teacher.-

1)She is never late for school.
2)We don't have Computer surfing on our timetable.
3)They do a lot of sums in class. 4)I don't like to sit at the desk in front of the teacher.