问题补充：
八．句型转换. (每小题2分, 共10分)
81. It is obvious that he has known the truth.
, he has known the truth..
82. I happened to meet an old friend in the street yesterday.
I met an old friend in the street yesterday.
83. The problem needs discussing.
The problem needs .
84. The government gave an order. All the victims in the earthquake of Yushu County, Qinghai Province were rescued.
The government gave an order .
85. To master a foreign language is not an easy job.
not an easy job a foreign language.81.obviously 82.by accident / by chance 83.to be discussed 84.that all the victims in the earthquake of yushu county ，qinghai province should be rescued 85.it is ； to master
答案：
(答案→)81.obviously 82.by accident / by chance 83.to be discussed 84.that all the victims in the earthquake of yushu county ，qinghai province should be rescued 85.it is ； to master
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