11.Dan's health has really ... ever since he stopped eating junk food . a)developed b)increased c)improved 13.Nathan

11. Dan\'s health has really c) improved ever since he stopped eating junk food. 

13. Nathan is b) too selfish to care about what others think of him.

15. We b) had cleaned up half the rubbish on the beach by the time jeft arrived.

18. Make sure you wear a hat when you\'re out in the b) boiling weather.