I listened to Professor Chen-Ning Franklin Yang’s lecture about his study and physics, but I failed to get its key ______ .
-- Are the books ________? -- No, they belong to ________.
How do you read 15,847?
There is a wooden bridge ______the river _______ my house.
-- _____ I ask you a question, Mr. Wang? -- Yes, you _______.
-- I like playing _____ piano. -- Oh, we have _____ same hobby.