4-5 cau hoi ngoai

What number is the one immediately after 1 plus 1?

Landmark 81 is the tallest building in Vietnam located in which city?

How many Bến Thủy bridges are there?

Is Bill Gates famous in the field of technology or agriculture?

What was the name of the country established by An Dương Vương?

Can sugar melt?

Is there any mention of a watermelon in the story "The Little Match Girl"?

Hoàng Liên Sơn is a mountain range in which region of our country?

Harvard University is in which country?

What are Twitter, Instagram, Facebook collectively called ?