在菜市场上，看到阿姨挑选西红柿，你应该（     ）

                                                                         My School Day in London
      Tim Hunt is telling 1 Chinese classmates about his school day in London.
     My school day in London is different 2 my school day here in China. School starts 3 nine o'clock. I get up at 7:00 4weekdays. I go to school 5 underground(地铁). It 6 about forty–five minutes. I have 7 at school. Classes are over at 3:15. It is early, 8 I stay at school and play games 9 my friends. I am 10 the basketball team. We practice(联系)on Monday 11 Wednesday. We have a match 12 Friday afternoon.
     On Saturday 13 I get up late. Then I 14 my parents tidy(弄整洁)the house and the garden. In the evening I often go to film or a club(俱乐部).On Sunday I have a good rest and of course, I do 15.

已知函数f（x）=cos（ωx﹣$\frac{\mathrm{\pi }}{6}$）﹣cos（ωx+$\frac{\mathrm{\pi }}{6}$）﹣2cos²$\frac{\omega x}{2}$（ω＞0）的最小正周期为π．

（Ⅰ）求ω的值；

（Ⅱ）求f（x）的单调递增区间．