The old rules have to be          because they only applied to the circumstances that existed when they were made a hundred years ago.

developed

established

observed

revised

考查动词的辨析。句意：老的规则需要被修改因为它们只适合一百年制定时的状况。A.develop发展；培养；B.establish建立；C.observe观察；D.revise修改，由because they only applied to 可知它只适用于以前，需要修改。故选D项。

There                   in the world              China is a great country with a long history and rich culture.

are no doubt; that 

are not doubts; if

is no doubt; that

is not doubt; if

考查固定句型和同位语从句。句意：毫无疑问，中国是世界上有着悠久历史，丰富文化的一个大国。分析句子可知，这个句型为 there is no doubt that 引导，表示“毫无疑问......”.本句为that that 引导的同位语从句，句意和句子结构完整。故选C项。

We shouldn't take         for granted that we still have a lot of time before the Entrance Examination.

this

that

it

such

考查代词。句意：我们不应该想当然地认为在高考前我们还有很多时间。这里涉及了一个固定句型take it for granted that 认为.....是理所当然的，该句型中it 作形式宾语，真正的宾语是后面that引导的从句。故选C项。