听下面一段对话,回答三个小题。
13. Who traveled abroad during the summer holiday?
14. What does David have to do now?
A.Join a summer camp. | B.Go to Xi’an. | C.Have a science class. |
15. When will they meet to have lunch together?
A.At a quarter past twelve. | B.At a quarter to twelve. | C.At half past twelve. |