15. It's already 10 o' clock. I wonder how it_________ that she was two hours late on such a short trip..
Helen ______ go on the trip with us, but she isn’t quite sure yet.
The World Wide Web is sometimes jokingly called the World Wide Wait because it ______ be very slow.
— Tom is never late for work. Why is he absent today ?— Something _______ to him.
— Shall I give you a ride as you live so far away ?— Thank you. _______.
If I ________ plan to do anything I wanted to. I’d like to go to Tibet and travel through as much of it as possible.