Daisy's class had a painting lesson with Ben's class. The teacher told them   1  different colors.
"There are three primary colors," she said. "Who knows   2   ?"
All the children   3  their hands. Everyone knew the primary colors: red, blue and yellow.
"   4   know what a secondary color is?" the teacher asked next. Ben knew. He put up his hand. " It's a color made from two primary colors," he said.
"Can you give me   5  ?" the teacher asked.
"Orange," Ben said. "We make orange by   6   red and yellow."
Daisy put up her hand. "Purple is    7   secondary color," she said. "We make purple by mixing red
and blue."
"Good," the teacher said." Now I want you all   8   a secondary color. "
The children began mixing colors. The teacher   9   round the class. She looked at all the colors the
children were mixing. She   10   Harry's easel(画架). "What color is that?" she  11  him.
"I don't know," he said. "I mixed all the primary colors   12   ," he said. "I wanted to see what color
  14   ."
"That   15   secondary color," the teacher said. "That   16  mud(泥巴)!"
(     )1. A. to make
(     )2. A. what they are
(     )3. A. put down
(     )4. A. Does anyone
(     )5. A. an idea
(     )6. A. mix
(     )7. A. another
(     )8. A. do
(     )9. A. walked
(     )10. A. came to
(     )11. A. said
(     )12. A. each
(     )13. A. can I get
(     )14. A. is
(     )15. A. looks

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