Many of my classmates are sitting together in the classroom.

What do you like doing during your holiday?

Mary and Tom are going on vacation this summer.

She often gives her grandparents packets of tea at Christmas.

The population of the world is growing.

She is going to school.

Mình không biết có đúng không?

How much does it cost to mail a local letter in Vietnam?

48 + 345 = 393

235 - 876 = - 641

lớp 1 chưa học số âm đâu