词形变化。

1. It’s _______(possible) for me to work out the problem. It’s too hard.

2. I think you can work out the math problem _______. (success)

3. Waste paper can be _______(cycle).

4. Please give me the full _______ (describe) of the accident.

5. As soon as they got to the railway station, it began to rain _______. (heavy)