... time.A. I couldn't finish it on time because you helped me. B. I couldn't finish it on time though you helped meC. I could finish it on time because you helped me.D. You helped me finishing ... sister have left the car key, I would have picked her up at the airport.4. He is riding a bus because he missed the last train.A. If he hadn't missed the last train, he wouldn't be ... fall harder.A. The higher they rise, the more harder they'll fall. B. They fall harder because they rise high.C. The higher they rise, the harder they'll fall. D. They rise the higher,...