Complete the sentences with at,in,on, or no preposition 1 i'd like to study law_university 2. we have to hand homework to the teacher_next monday 3. hurry! the lesson starts_five minutes 4. my school is in marshall street, right _ the city centre 5. what are you doing_christmas day? 6. there's a garden _ front of the house 7. some 50 years' time, traditional notebooks will be a thing of the past 8. some students can't concentrate when they are sitting_their desks 9. let's meet_the front of the school building 10. we're having a school party _ saturday night