1. Hearing a w_______ (警告) that an earthquake was on the way, the whole family ran to the square quickly.
2. Is there a p_______ (可能)that you will work abroad？
3. F_______ (幸运的是)，I was able to keep the car in control until I could pull over and stop.
4. It happened that no one was on the island during the volcanic e_______ (喷发).
