3 GRAMMAR Complete the sentences with the correct form of the verbs in brackets.

1. If Gary hadn't left Boston, he wouldn't have met Chloe. 2. If oil hadn't been found in Alaska, it wouldn't have become a rich state. 3. There wouldn't have been a Gold Rush if James Marshall hadn't picked up some shiny stones. 4. "World Bicycle Relief" wouldn't have been able to send so many bikes to Africa if Clarity hadn't given them the money.