17.
A. Give up the hope of joining the tour.
B. Find out who is going to join the tour.
C. See who can give him a ride for the tour.
D. Don't give up the hope and try in a few days.
18.
A. He is not very far away if she wants to visit.
B. He welcomes her phone calls.
C. He doesn't believe she will miss him.
D. He will call her to tell some jokes.