Long long ago, there (A. are B. were) three little pigs. They lived in a small house in the forest . One day, they left (A. his B. their ) mother. The winter was coming! They wanted 18. (A. to B. /) build new houses by themselves. The first pig built a straw(稻草) house. The (A. two B. second) pig built a stick house. The last house was built of bricks. Bricks are (A. heavier B. heavy) than straw and sticks. The wolf came. He blew the other two pigs' new (A. houses B. house) down. (A. But B. And) the last pig's house was stronger (A. than B. then) their houses. The wolf (A. can't B. couldn't) blow it down. Finally, the wolf climbed on the top of the house. He went down the chimney(烟囱) and (A. fell B. felt) into fire. The three pigs were happy.
