More and more people have a low-C life and the air is _________ than before.
Look at the poster! It says that there ________ a concert in our school next Saturday.
Tom, I heard that your mother went to Qindao last week. Could you tell me ________?
–Why were you late for school this morning?–I got up very early this morning, ________ I didn’t catch the first bus.
–Have you ever been to Disneyland?–Yes. I ________ there last summer.
–Would you like another cup of tea?–No, thanks. I ________ be off now. Rose is waiting for me.