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One afternoon, Mary and her little brother Tom, were playing hide­and­seek in the street outside the post office.

Mary had shut her eyes when Tom noticed that the small door of the letter box was left open. The postman had just taken all the letters out and got into the post office. Tom climbed into the letter box and shut the door from the inside. When he knew he couldn't get out, he became very frightened and cried. At the same time Mary was looking for him everywhere. But she could not find him. Then she came back to the letter box again and heard her brother crying in it. She ran to tell the postman at once.

With the help of the postman, Tom got out of the letter box. “Next time, if you want to hide in the letter box, don't forget to put up a stamp on yourself,” said the postman with a smile.

1．Tom was Mary's ________. (   )

A．friend

B．little brother

C．elder brother

2．One day Mary and Tom were playing ________ in the street outside the post office. (   )

A．basketball

B．football

C．hide­and­seek

3．Tom hid himself into the ________, and then he closed the door from the inside. (   )

A．box

B．basket

C．letter box

4．Tom felt very ________ when he knew he couldn't get out. (   )

A．frightened

B．interested

C．satisfied

5．Mary found her brother was in the letter box, when she heard Tom's _______ in the letter box. (   )

A．crying

B．singing

C．smiling