A weak point

Mr. Wall is the manager of a big bank. Last Thursday afternoon, Mr. Nelson came to Mr. Wall's office in the bank and talked to him for a long time. Then Mr. Wall looked at his watch and said, 'Look at the time! The bank closed a quarter of an hour ago! They've locked all the doors now, and there are three of them between us and the street. But I've got keys, because I sometimes work late here after everyone else. '

He took some keys out of his pocket.

Mr. Wall and his visitor went out of his office, and then they saw Mrs. Field. She cleaned the bank every evening after 5.30.

'Go out through the back door,' she said to the manager. 'They never lock that one.'

1. What was Mr. Wall?

2. Did anyone visit him last Friday afternoon?

3. What did Mr. Wall say to the visitor then?

4. Did he take some keys out of his pocket?

5. And did Mr. Wall and his visitor go out of the office?

6. Did they see anyone then?

7. What work did Mrs. Field do in the bank?

8. What did she say to Mr. Wall?