题目内容：

A plane   1. (take) off from Malaysia’s capital Kuala Lumpur(吉隆坡) in the early hours of March 8. It was heading to Beijing.

But about two hours into the  2. (fly)， the plane   3. (appear).

There were 239 people on board the Malaysia Airlines flight，  4. (include) 154 Chinese.

About 12 countries， together with China and the US，  5.  (join) the search for the 6. (miss) plane and passengers，.

The plane’s disappearance was a “mistery”， said officials.

The plane was flying at a 7.  (high) of more than 10，000 metres when it   8.  (sudden) lost contact. The weather was clear. The pilots didn’t make any distress calls. (求救信号).

When a plane crashes(坠机)，broken parts are usually recovered. But as of March 13， officials have not found anything.

People are also talking about a possible hijacking(劫机).

Interpol(国际刑警组织)said that two people on the flight used   9.  (steal) passport(护照). But that information alone isn’t evidence(证据) of a hijack.

The investigation(调查)  10.  still _____(go) on. It could take months or even years to find out what   11.(happen) to the flight.

“We are looking at all possibilities，” said Malaysian Transport Minister Hishamuddin Hussein.

“Our focus now is   12. (find) the plane.”