In many families, the most important decisions are______by many women.

A. done

B. made

C. arrived

D. given

Mark the letter A, B, C, or D to indicate the most suitable response to complete each of the following exchanges.

 Two friends Diana and Anne are talking with each other about their shopping. 

-Diana: “Look at this catalog, Anne. I think l want to get this red blouse”.

-Anne: “____”.

A. Don't you have one like this in blue?

B. That's a long way to go, dear.

C. No, thank you

D. I'll go myself, then.

Mark the letter A, B, C, or D to show the underlined part that need correction in each of the following sentences.

There (A) are probably (B) around 3,000 languages (C) speaking in (D) the world.

A. are

B. around

C. speaking

D. the world

Cho phương trình  x 2 − 2 m x + m 2 − 1 = 0    1 ,  với m là tham số.

1) Giải phương trình (1) khi m= 2 

2) Chứng minh rằng phương trình (1) luôn có hai nghiệm phân biệt với mọi m. Gọi  x 1 ,   x 2  là hai nghiệm của phương trình (1) lập phương trình bậc hai nhận  x 1 3 − 2 m x 1 2 + m 2 x 1 − 2  và   x 2 3 − 2 m x 2 2 + m 2 x 2 − 2   là nghiệm.