16 . ---I’m thinking of going back to school to get another degree.

---Sounds great!________.

A. It all depends      B. Go for it           C. Never mind        D. No wonder

17. You will never achieve success _______you keep working hard.

A. if               B. because             C. when             D. unless

18. He _____ some foreign guests around our school at that time.

A. is showing       B. had shown           C.was showing        D. showed

19. The match has been _________ until tomorrow because of bad weather.

A. passed up        B. put off            C.banked on            D. turned down