The boy is too young. He doesn’t understand it. *
The boy is too young enough to understand it.
The boy isn't old enough to understand it.
The boy is young enough to understand it.
The boy is enough old to understand it.

`to` CT: S+ be+ adj+ for O+ to V: đủ để làm gì.

`-----------------`
She is humorous, helpful and ___________ (SOCIAL) *
socialize
sociable
sociability
sociably

vì humorous, helpful là adj nên ta cần 1 tính từ để cùng loại.

`-----------------`
Choose the word whose main stress pattern is not the same as that of the others. *
agree
countless
arrange
assistant

vì thứ nhất còn lại thứ 2.

`-----------------`
Choose the word whose main stress pattern is not the same as that of the others. *
sociable
volunteer
orphanage
photograph

vì thứ 3 còn lại thứ nhất.