阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答题卡相应位置。
Unprecedented Aviation Mystery
A Boeing 777 took off from Malaysia’s largest city of Kuala Lumpur at 0:41 am on March 8.
小题1:_____destination was Beijing. But the flight never arrived, 小题2:______ （leave） friends and relatives of the passengers onboard weeping and worrying.
There were 239 people小题3:____ board the Malaysia Airlines flight，including China， Vietnam，the US，Singapore， and the Philippines 小题4:_______ still ______ （search）for the missing plane.
Its 小题5:__________ （disappear）is an "unprecedented（史无前例的）aviation mystery”， Azharuddin Abdul Rahmanm，head of Malaysia’s Civil Aviation Authority，said on March 10.
There was no sign of 小题6:____ crash.
About two hours of after taking off，air traffic control suddenly lost contact with the plane. The weather was clear，the pilots didn't make any distress calls，小题7: no debris 碎片） was found in the area 小题8:______ the flight last made contact.
Besides，airplane crashes小题9:________ （typical）occur during takeoff or landing. Only 9 percent of fatal accidents happen 小题10: ______ a plane is at cruising（平稳行进的）altitude，according to a report by Boeing in August.
小题1:Its
小题2:leaving
小题3:on
小题4:were … searching
小题5:disappearance
小题6:a
小题7:and
小题8:where
小题9:typically
小题10:when
题目分析：这是一篇新闻报道。本文报道了马航失踪的消息。
小题1:考查代词。这里的代词Its代指Boeing 777’s。
小题2:考查非谓语动词。句中逻辑主语为the flight，与leave之间为主动关系，故用现在分词。
小题3:考查介词。本题考查短语on board，指的是在飞机上。
小题4:考查时态。这里用过去进行时，表示过去正在发生的动作。
小题5:考查名词。根据前面的代词its，故后用名词。
小题6:考查冠词。crash为可数名词，故前用冠词a。
小题7:考查连词。这里前后句为并列关系，故用连词and。
小题8:考查定语从句。句中先行词为area，在从句中作地点状语。
小题9:考查词性。这里修饰动词occur，故前用副词修饰。
小题10:考查连词。这里考查when引导的时间状语从句。