We use the numbers 1, 2, 3, 4, 5, 6 (each number is used only once) to fill in the circle in the picture on the right. The sum of three numbers on each side of the triangle is 10. If number 1 is put in the circle as shown in the picture, which number is in the darkened circle?

An English proverb says: “Lose a battle, but win a war.” Which of the following historical events best matches the proverb above?

What is the symbol for the national border on a map?

Đạt follows the instruction to finish this process below.

Four friends make predictions on the result of a race for 4 runners An, Bình, Cường, Dũng:

- An finishes second; Bình finishes third.

- Bình finishes second; Cường finishes fourth.

- Cường finishes third; Dũng finishes second.

- Dũng finishes first; Bình finishes third.

Four runners finish in four diferrent positions, and each friend has one correct prediction, and one wrong prediction. Which position does An finish?

What activity is described in the image on the bronze drum in Hùng’s time?

A solution is a _______ mixture that combines a solute and a solvent.

Which of the following countries lies in the Southern hemisphere?