1. People must learn about keeping the environment ________________ . (pollute)
2. A letter should always end with the ________________ of the writer. (sign)
3. She was ________________ weakened by the long illness she had. (severe)
4. It was really ________________ of you to take that money without asking. (honest)
5. This new film is ________________ good. (exception)
6. My broken leg means I’ll be ________________ to go on holiday with you. (able)