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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 | 
