Yao Ming is one of the top basketball players in the world. We all like him.

If a girl doesn't know       to wear or        to dress up, she can ask her best friend for help.

In crowded places like airports and railway stations, you     take care of your luggage.

- ________ book is this?-- It's Mary's.

--- Do you think people will have ________ work to do in the future?--- I think so. And I think they will have _______ chances to travel.