谨慎地使用职能权力，包括两层含义，首先要认真分析授予职能权力的_________，其次要明确职能权力的_____________。
参考答案：必要性；性质
As well as ________ all his homework, he helped his mother with a good cleaning around the house.
A. finishing B. finished C finishes D. to finish
-__________ will you stay in America?
-About two months.[ ]
A. How many
B. How often
C. How long
