Ⅰ.单句语法填空
1．The cars that drove the American Dream have helped to create ________ global ecological disaster.
2．Two ________ two is four.
3．The price of oil ________ (go) down by 10% up to now.
4．Pompeii was destroyed when the volcano ________ (erupt)．
5．They set sail in the morning and make ________ to a small town before dark.
6．Seeing his teacher come in, he sat back ________ (immediate)．
7．A great decline in young work force is likely ________ (occur) in China.
