Complete these sentences with the correct forms of the verbs in the brackets?
1)she had to ask the boys (stop)(ride) their mini-scooters in the corridor
2) don't start (try) (learn) algebra before you have finished (learn) (do) simple things in arithmetic
3) sumi hates (get up) early in the winter and (get ready) in the dark
4)i'd love (have) the opportunity of (meet) you again
5) our teacher has promised (help) us (prepare) for our next week's test
6) we can't think of (buy) a new television set before (sell) the old one.