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