Here are the correct answers for the sentences:

1. Mary: "I love chocolate."
Jill: "Mary said (that) she **loves** chocolate."

2. Mary: "I went skiing."
Jill: "Mary said (that) she **had gone** skiing." (c. have gone)

3. Mary: "I will eat steak for dinner."
Jill: "Mary said (that) she **would** eat steak for dinner." (c. would)

4. Mary: "I have been to Sydney."
Jill: "Mary said (that) she **had been** to Sydney." (a. had been)

5. Mary: "I have had three cars."
Jill: "Mary said (that) she **had** three cars." (b. had)

6. Mary: "I have never been to London."
Jill: "Mary said (that) she **had** never been to London." (a. had)

7. Mary: "I was swimming."
Jill: "Mary said (that) she **had been** swimming." (b. had been)

8. Mary: "I had a cat."
Jill: "Mary said (that) she **had** a cat." (c. had)

9. Mary: "I can't swim."
Jill: "Mary said (that) she **couldn't** swim." (b. couldn't)

10. Mary: "I won't buy a new car."
Jill: "Mary said (that) she **wouldn't** buy a new car." (c. wouldn't)

Feel free to ask if you have more questions!