Here's a short story:

Last Saturday night Jenny was walking through a mall in London , texting on her phone. She wasn't watching where she was going , so she fell into a sewer and got trapped. Luckily she didn't hurt badly. She quickly climbed out and walked away. But her accident was caught on a mall camera. Then someone posted it on YouTube. The video was viewed almost 2 million times and received national attention. Jenny was angry with this, but she learned a deep lesson: Texting while walking is dangerous. This time I just fell into a sewer. Next time I didn't know what would happen. Maybe I would be knocked down by a car or something else. It was horrible. Jenny may be famous for her mistake. After that, she was laughed at by her friends and workmates. She _ what she had done. But it was too late. However, she wasn't the only one who got into trouble while texting on the phone. In 2008, more than 1000 Englishmen visited hospital for similar reasons. They were walking and texting or talking on the phone. Suddenly a wall appeared! Or a hole or something like that got in the way. There were cuts, bumps, broken bones and even worse result happened on them. So we must be careful when we are walking. Don't send messages or talk with somebody on the phone while walking. Or you may hurt yourself and become another Jenny in the future. (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: Who may be harmed?
Guess: ourselves

Question: When?
Guess: while sending text messages or talking to someone on the phone while walking

Question: Who is this about?
Guess: Jenny

Question: When did she have an accident?
Guess: last Saturday night

Question: Where was she?
Guess: a mall in London

Question: What was she doing?
Guess: walking

Question: And what else?
Guess: texting on her phone

Question: Did others have accidents while texting?
Guess: yes

Question: How many?
Guess: more than 1000

Question: In what year?
Guess: In 2008

Question: What nationality?
Guess: English

Question: Did they receive medical care?
Guess: yes

Question: For what?
Guess: cuts, bumps, broken bones and even worse

Question: What did Jenny fall in?
Guess: Saturday

Now answer the following question in the same format.

Question: What did she fall in?

a sewer