They arrived late, so they didn't have good seats

Question 16. They arrived late, so they didn't have good seats.
A. However late they arrived, they had very good seats.
B. The late arrivers still had good seats.
C. Had they arrived earlier, they might have got good seats.
D. Unless they arrived earlier, they wouldn't have good seats.
Question 17. His speech was boring. Everyone got up and left.
A. He got up and left because everyone was talking.
B. No one stayed to listen to him because his speech was so boring.
C. Every one stood up so that they could hear his speech.
D. His speech was interesting enough for everyone to listen.
Question 18. It's waste of time to try to explain anything to Tony.
A. Tony should be given explanation
B. It's not worthy trying to explain anything to Tony
C. To save time, explain it to Tony
D. It's well worth trying to explain things to Tony