1.I am at school at the weekend

2.She does not studyon Friday

3.My students are not hard working

4.he has a new haircut today

5.I usually have breakfast at 7:00

câu b: (x^2+2x-3)/(x^2+3x-10).(x^2-9x+14)/(x^2+7x+12)

= (x^2+3x-x-3)/(x^2-2x+5x-10).(x^2-7x-2x+14)/(x^2+4x+3x+12)

=(x+3)(x-1)/(x-2)(x-5).(x-7)(x-2)/(x+4)(x+3)

=(x+3)(x-1)(x-7)(x-2)/(x-2)(x-5)(x+4)(x+3)

=(x-1)(x-7)/(x-5)(x+4)

The man to _______ we have just talked is the Director General.

A. Who

B. that

C. whom

D. 0