They didn't play well, but they won the game

Rewrite as indicated below. The first is already done as an example
11. They didn't play well, but they won the game.
a. Although ....................
b. Despite ......................
12. They felt very cold but they didn't turn on the heater.
Despite .........................
13. Bill had a terrible headache. However he kept working.
a. Although ...................
b. In spite of ..................
14. He has all the necessary books but he doesn't use them to study.
Despite .........................
15. She works very hard but she doesn't deserve a raise.
a. Although ...................
b. In spite of ..................
16. She is not prepared for the test, but she has to do it.
Despite .........................
17. She was ill but she had to go to school.
Although ......................
18. It was a nice sunny but there was nobody at the beach.
a. Although ...................
b. In spite of ..................
19. He arrrived later but he finished work earlier than the others.
Although ......................
20. The new waitress seems honest and diligent. However the boss doesn't like her.
a. Although ...................
b. In spite of ..................