【题目】Have you heard that the research he spent most of his time_______ perfect success?

【题目】

【题目】The river is about six thousand six________and seventy kilometers long．

【题目】I’d like to go with you, I’m too busy.

【题目】Does he________a bus________？

【题目】—Does the tiger come from Europe? — .

【题目】Although the old man lives_____ at home, he don’t feel ____because he has many pets with him.

【题目】The house the famous writer bought many years ago is a museum now.

【题目】The old photo on the wall often ____ me ____ the sweet memories in my childhood. .

【题目】 Kate does well in singing. The underlined part means .