Mr. Robertson was the owner of a large company．One day he went into his office early to get ready to go to the airport and set out for a faraway city．When he was leaving his office．Bill，a night watchman，came in．Bill just came off work．After saying “good morning” to Mr. Robertson，Bill told the owner about his bad dream：last night he dreamed Mr. Robertson’s plane crashed soon after take-off．Hearing this，Mr. Robertson was surprised．He decided to go by land．

Bill's dream came true．That morning the plane really crashed just after it had taken off．Later Mr. Robertson returned to his office and heard the accident．To express his thanks，Mr. Robertson gave Bill 5,000 dollars with a letter．Mr. Robertson told Bill that a man like him should be dismissed（解雇）．Bill was surprised and asked，“For what reason?” Mr. Robertson said．“Go home and read the letter，and you’ll know why．”

Bill went home and opened the letter in a hurry．After reading it，he became very sad．In the letter there was only one sentence．But it was enough to tell the reason for his dismissal．Can you guess why?

1．Did the night watchman work hard?

2．How did Mr. Robertson feel when he was told what Bill had dreamed the night before?

3．How did Mr. Robertson go to the faraway city at last?

4．What did Bill know when he opened the letter?

5．What sentence could be in the letter?