Many of the students in my class go to school _______.[ ]

If you try to sit on two chairs, you will fall them For life, you must choose one chair. [ ]

Mike went to the library ________ some books yesterday.

When do you think is the best time to visit Jiangxinzhou? —You ______ go there in August. Many kinds of fruits are on sale then.

How long have you ______ this book ?