—Look, someone left a book.—Oh, yeah … This book ________be Kitty’s. Only she likes to read this kind of books.

Teenagers _______ allowed to drive in the street ．

 --Will you read me a story, Mummy?--OK. You ________have one if you go to bed as soon as possible.

—The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job?—________ my students have a try?

 After you read the article “Why fast food is slowly killing you”, you         stop eating fast food.