Question

Điền giới từ vào .... : Before / under / out / between / of

Even before he is born,, a baby has small teeth ……………… his gums . At about the age……………… six months, he first tooth starts to grow. ……………… the young child is threeyears old, he has twenty small teeth. ……………… the ages of six and twelve, a second set ofteeth form in the gum below the first teeth and push them

Answer 1

Điền giới từ vào .... : Before / under / out / between / of

Even before he is born,, a baby has small teeth ………under……… his gums . At about the age…………of…… six months, he first tooth starts to grow. …………Before…… the young child is threeyears old, he has twenty small teeth. ………Between……… the ages of six and twelve, a second set ofteeth form in the gum below the first teeth and push them