Tìm \(m\) để \(x^2-3x+2-m>0\forall x\in R\).

Tìm \(m\) để \(x^2-2x+2+m=0\) có 2 nghiệm phân biệt thỏa mãn \(x_1< 1< x_2\).

He doesn't allow his daughter to go out late.

-> His daughter ... .

A letter ... by my mother now.

A. is writing          B. is being written          C. writes          D. is written

She likes to meet and spend time with other people. She is very ... .

A. unfriendly          B. rude          C. sociable          D. introvert

As planned, we ... our grandparents this weekend.

A. will visit          B. visit          C. are going to visit          D. is going to visit