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)