3. Complete the sentences with these words.
for, in, off, on, out, through to, up
1. We were waiting___ a bus for ages - then suddenly two pulled___ together!
2. I ran and got___the train just as it was pulling___ of the station.
3. We went___ passport control at three o'clock, but the plane didn't take ___until eight!
4. I checked ___and then went ___ gate 21.