Mr. Brown teaches English in a middle school. He's a good teacher and is popular among his students.
     Mr. Brown has two three-year-old sons. They're twin (双胞胎的) brothers. Mr. Brown calls them Ben
and Tom. They like vegetables, fruit and milk. They also like to take a walk with their parents and their dog,
Pick. They're very healthy and clever. Everyone likes them.
      Jim and Alex are Mr. Brown's students. They often go to see the twins and play with them. Sometimes
they bring some fruit to Ben and Tom.
     One Saturday, Jim and Alex went to Mr. Brown's house. When the twins saw them, they were very happy,
and they began to play.
     Then Alex said,"Look,Tom and Ben! Apples! Well, I have a question. If one of you can answer right, I will
give him one." The twins listened to Alex carefully.
     "I have two apples. If I eat one now, how many apples will I have, then?"
      "One." Ben said.
     Tom answered, "Two."
     "Two?" Jim said, "Why?"
      "Oh,one is inside and the other is outside."

请根据材料内容完成下列句子(每空一词)。
1. Mr. Brown is an_______ teacher in a middle school.
2. Ben and Tom are Mr. Brown's twin ____________.
3. Ben and Tom like to take walks with their parents and __________.
4. Jim and Alex went to Mr. Brown's house on __________.
5. Jim and Alex may bring some ___________ to Ben and Tom.