17. 1 haven't we 2 didn't they 3 won't you 4 isn't it 5 don't you 6 can't we 18. 1 shocking 2 driving 3 drinking 4 walking 5 wedding 19. 1 fighting 2 building 3 taking part 4 seeing 20. 1 would be 2 would come 3 warned 4 would have prevented 5 knew 6 were