An Art tescher asks his students to draw pictures.They can d

An Art tescher asks his students to draw pictures.They can draw anything they want.After a while,a boy hands in his picture.The teacher looks at nothing on the paper."What did you draw?"the teacher asks.
"A cow and grass?"the boy answers.
"But where is the grass?"the teacher asks again.
"The cow ate up the grass,"answers the boy.
"Where is the cow?"
"When it ate up the grass,it felt thirsty and went to drink water."
1Who asks the students to draw pictures?
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2Can the students draw a house?
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3Can the teacher see anything on the boy's paper?
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4What does the boy say he drew?
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5What did the boy draw in fact?
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可能又打错的