Rewrite as indicated below. The first is already done as an example.
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 ..................