Ⅰ.单句语法填空

　　1．Pakistan came into ____________ (exist) as an independent country after the war.

　　答案： existence

　　2．She strongly objected to my mother’ s marriage.Surprisingly，my mother’s reaction ____________ it was rather calm.

　　答案： to

　　3．The officer demanded that such things ____________ (prevent) from happening again.

　　答案： (should) be prevented

　　4．An American plane is reported ____________ (crash) in the Atlantic Ocean with 228 people aboard，the airline’s worst disaster in its 75­year history.

　　答案： to have crashed

　　5．The two girls are so alike that strangers find ____________ difficult to tell one from the other.

　　答案： it/it’s

　　6．What makes me ____________ (puzzle) is why he left the country without telling anyone.

　　答案： puzzled

　　7．____________ was needed at that time，she told me，was some good luck.

　　答案： What

　　8．During those four years，he worked day and night，thus ____________ (improve) his theory gradually until it was complete.

　　答案： improving

　　9．There were many fish ____________ (float) in the river because of the serious pollution.

　　答案： floating

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