Our headmaster isn’t in his office. I can’t find him anywhere. Did you notice him ______ the office?
—When will you return the book to me?—I’ll give it to you _________ I finish it.
“Learning from Lei Feng Day” is only two weeks from now. We need to ________ a plan about it.
—Look, someone left a book.—Oh, yeah … This book ________be Kitty’s. Only she likes to read this kind of books.
Look, so many people are running out of the station. I wonder what ________.
—Which of the two pairs of shoes will you take?—I’ll take ________. They are too small for me.