If you ___________ (help) me, I ___________ (help) you

15. If you ___________ (help) me, I ___________ (help) you.

16. If they ____________ (catch) the bus, they ___________ (arrive) on time.

17. If it _____________ (rain), I ____________ (get) wet.

18. They ___________ (visit) Eiffel Tower if they __________ (go) to France.

19. If it (rain)__________we (cancel)___________the match