Xinjiang is one of the largest autonomous regions in China. It’s _____ the northwest of China. [ ]

Please give this book _________ Lin Li. It’s his.[ ]

Do you have enough men to carry these chairs? —No. I think we need _______ men.

Have you returned the book to the library ____? —Yes, I have ____ returned it.

The train ________ here at 6 o’clock.