Mr and Mrs Smith have just opened a small restaurant. In order to attract customers, they put a notice in front of the restaurant, which said: "Meals on the house for three days."
A foreign student who didn't know much English passed by the restaurant on the second day. It was lunchtime and he felt hungry. "Well, here is a restaurant. I'm going to have something to eat," he said.
He saw the notice when he walked towards the restaurant. "American people are really strange. They even eat dinners on the house! But how can I get onto the top of the house?" he asked himself
He looked around and found a ladder(梯子)against a tree nearby. He was very glad. But as he reached the top, he heard someone shouting at him, "Hey, what are you doing up there?" Mr Smith was looking at him angrily. Beside him was a policeman.
‘Doesn't your notice say 'Meals on the house for three days'? Is it just a joke?" the foreign student answered.
On hearing this, both Mr Smith and the policeman burst into laughter.
Do you know the meaning of on the house"?
The Smiths have____.

A．opened a restaurant	B．built a house
C．climbed onto the top	D．been policemen

Why do Mr and Mrs Smith put up the notice?

A．Because they wanted to attract policemen

B．Because they wanted people to eat on the roof

C．Because they wanted to attract more customers

D．Because they liked to play jokes

The student walked past the restaurant                    .

A．when the Smiths started their business

B．when the Smiths put on the notice

C．when the policeman came to the restaurant

D．when it was time to have lunch

The student            so Mr Smith shouted at him.

A．was very hungry	B．knew little about English
C．climbed onto the top of the house	D．took away the ladder

"On the house" may mean that the meal

A．is taken on the house	B．is paid on the house .
C．is made on the house	D．is free for the customers;