Đáp án đúng là: A volcano is a mountain that is open at the top.
Giải thích: Dựa vào câu: A volcano is a mountain that is open at the top.
Dịch: Một núi lửa là môt ngọn núi mà mở ở trên đỉnh.
Choose the suitable word or phrase to each sentence by circling a, b, c, d
He was unhappy beacause he…………in the exam.
“why are you staying home today ?’’’ …I don’t know where to go .’’