Sure, here are the correct answers for each question:

Question 12: "You look tired." "Yes, I _____ basketball."
- D. have been playing

Question 13: I would like to see Tina again. It's been a long time _____.
- C. since I saw her

Question 14: Bod and Alice have been married _____.
- D. for 20 years

Question 15: I am looking for Paul. You _____ him?
- A. Have seen

Question 16: Unless she _____ extra, she will not complete the work.
- C. pays

Question 17: The house at the end of the street which _____ empty for years has been sold.
- D. has been

Question 18: All right, you'll try to fix the television! But I _____ you know what you're doing.
- A. hope

Question 19: Who _____ at the door?
- B. is knocking

Question 20: How long it _____ you to get to the library?
- A. does - take