阅读下列各小题，根据括号内的汉语提示，用句末括号内的英语单词或其适当的形式完成句子，使句子完整通顺。
It’s our duty to                                                       .(尽我们最大的努力去帮助残疾人)  （try）
They closed all the windows                                            (为了房间更加保暖).（order）
---Why don’t you go hiking in the mountains at weekends?
---                                      (我害怕蛇) when I am in the forest.    (afraid)
---                                            (你是怎样了解到)the news?   (know)
---Teacher told me by sending a message on the mobile phone.
---                                    (你的哥哥长得是什么样的)？
---He is of medium build, and he has short hair.    ( look )
---Do you often listen to the music while you are doing housework?
--- Yes, it                               （使我放松）when I am busy.    (make)
---How long have you been an English teacher?
---                                 (自从我放弃了医院的工作)in 2000.    (give)