My younger brother and I were alone at home.I was doing my homework while my brother was watching TV.Suddenly the doorbell rang. My brother rushed to the door thinking that our parents had come home; he unlocked the door and opened it.
Outside stood a tall man wearing a black raincoat and black boots. He said that he was a salesman and asked politely if our mother or father was at home.Without thinking, my brother said,“No.”He asked if we would like to buy some books.I explained that we were not supposed to buy anything without our parents’ permission. As I was about to close the door,he forced his way into our house, took out a knife and forced me to tie up my brother’s hands with a rope which he took out from his pocket. I tied up his hands but I tied it in a special way so my brother could unite himself. The man then tied my hands up and locked both of us in the kitchen.
Soon he went upstairs to search the bedroom for valuables. I managed to teach my brother to unite the rope on his hands. He then united me. I rushed to the telephone to call the police,but the line was dead. The doors were all locked from the outside. Luckily, the robber forgot to lock the kitchen window. My brother managed to go out of the house through the windows and I told him to go to the neighborhood police post and ask for help.
My brother brought the police to our house and the robber was caught. Soon, our parents came home. My parents were thankful that we were not hurt but they said I should have stopped my brother from opening the door to strangers. I learned a lesson on safety.
21. Before opening the door, the author’s brother __________.
A. thought it was one of his friends B. didn’t ask who it was
C. knew it was a stranger D. felt very frighted
22. We learned from the second paragraph that ___________.
A.the author let the stranger in
B.the man left the author at a loss
C.the author wanted to buy some books
D.the author obeyed his parents
23. We can infer from the text that ______________.
A. the robber had locked all the doors from the outside
B. the parents were sorry for not teaching their children about safety
C. the author was strong enough to fight with the robber
D.the neighbor helped the two brothers call the police