=>
17. The girl who sings in the group has got green hair.
18. I was surprised by what you said.
19. I can't think of an answer to your question.
22. Sue knows Italian better than I do.
23. He invited me to have dinner with him.
24. Since she had an operation on her foot, she has had to use crutches.
25. His latest play, which was well reviewed by the critics, has been a great success.