1._____destination was Beijing. But the flight never arrived，
2.______ （leave）friends and relatives of the passengers onboard weeping and worrying.
There were 239 people 3.____ board the Malaysia Airlines flight，including China，Vietnam，the US，Singapore，and the Philippines 4._______ still ______ （search）for the missing plane.
Its 5.__________ （disappear）is an "unprecedented（史无前例的）aviation mystery”，Azharuddin Abdul Rahmanm ，head of Malays ia’s Civil Aviation Authority，said on March 10.
There was no sign of 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，7.____ no debris （碎片）was found in the area 8.______ the flight last made contact.
Besides，airplane crashes 9.________ （typical）occur during takeoff or landing. Only 9 percent of fatal accidents happen 10______ a plane is at cruising （平稳行进的）altitude，according to a report by Boeing in August.
参考答案：
1. Its
2. leaving
3. on
4. were…searching
5. disappearance
6. a
7. and
8. where
9. typically 10. when