请根据选项回答（78）题：
A. to how make
B. how to make
C. how was made
D. how making
施工过程中发包人需对原工程设计变更，应提前（）以书面形式向承包方提出变更通知。
A. 7天
B. 14天
C. 15天
D. 28天
What keeps Grimsvoto still？
A. The slow flow of water．
B. The low water temperature．
C. The thick glacier．
D. The water pressure．
It takes more energy to do a job in two minutes than__________ the same job in two hours．
A. to do
B. do
C. will do
D. is doing
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