There is a door ___ the wall.[ ]

Tell me about Brother Sharp, please. — He was a beggar(乞丐). He became a blue-eyed boy(红人) on the Internet because of his cool appearance and dressing style.

This isn’t ______ iPad, mine looks the same as ______ .

How do you study Chinese so well?-_________ reading plenty of books.[ ]

Do you know__________ they are talking_________?[ ]