16. She is not prepared for the test, but she has to do it.
Despite isn't preparing for the test, she has to do it.
17. She was ill but she had to go to school.
Although she was ill. she had to go to school.
18. It was a nice sunny but there was nobody at the beach.
a. Although it was a nice sunny, there was nobody at the beach.
b. In spite of nice sunny, there was nobod at the beach.
19. He arrrived later but he finished work earlier than the others.
Although he arrived late, he finished work earlier than the others.
20. The new waitress seems honest and diligent. However the boss doesn't like her.
a. Although the boss does't like the new waitress, she seems honest and diligent.
b. In spite of being honest and diligent the new watress , the boss doesn't like her.