People in Korea and Japan are supposed to bow when they meet the first time.
She hasn’t visited Thailand _______ England yet.
–How long has Mr. Liu taught English? --- _______ 1998.
–Would you like to go to see the film with us?--Sorry, I can’t. Because I ________ it twice.
Scientists think that there has been life on Earth for _______ years.
Don’t make any noise. The baby ________ in the bedroom..