15. Which sign can you probably see beside a deep river?

14.-Hello, 7832879? -______. Please speak more loudly.

　A. Sorry, I can't hear you 　 　　　B. Yes, I am

　C. I'm afraid not 　　　　　　D. No, you're wrong

13.--It's a fine day. Shall we go swimming?

　　　--_____, Let's go.

　A. It's boring 　　　　　　　 B. Of course, you will

　C. That sounds good 　　　　　　D. No, thank you