单项选择题

Directions : This part is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. Both the dialogues and questions will be spoken only once. When you hear a question, you should decide on the correct answer from the four choices marked , given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center. Now the test will begin.

A. Return these books.
B. Go back home.
C. Write a book.
D. Leave class early.