Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Mr. Stringer:  I 'm sorry , madam , but I can not permit mice in my hotel .
Helga: How dare you say that when your rotten hotel is full of rats anyway ?
Mr. Stringer: Rats ? There are no rats in this hotel !
Helga: I saw _ one _ this morning running along the corridor , into the kitchens .
Mr. Stringer: Madam , you only arrived in the hotel this afternoon .
Helga: Morning , afternoon , I saw a rat in your hotel , and if matters do not improve , I shall have to report you to the public health authorities .
Mr. Stringer: Look , madam , I 'm not prepared ...
Luke: The cakes in the lounge are nibbled around the edges , too . I can show you .
Helga: If you are not careful , the health people will order the whole hotel closed before everyone gets typhoid fever .
Mr. Stringer: You ca n't be serious , madam !
Helga: I have never been more serious in my life . Now - will you or will you not let my grandchild keep his hygienic and perfectly harmless pet mice ?

Rats