How kind you are! You always do what you can __________ others.
A:help
B:helping
C:helps
D:to help
(Ⅰ)若曲线y=f(x)在点(1,f(1))处的切线平行于x轴,求a的值;
(Ⅱ)求函数f(x)的极值;
(Ⅲ)当a=1的值时,若直线l:y=kx﹣1与曲线y=f(x)没有公共点,求k的最大值.
补全句子:
-- What do you____at school?
-- I have English, Chinese and PE.