—Why didn't you come to Mike’s birthday party yesterday?---Well, I ____, but I forgot it.
10. It looks ______ you are ill. You should go to see the doctor.
9. Please ______ your sister to bring the ticket for the concert.
8. Be careful ! The slightest spark could ______ the fireworks.
7. The police are offering a $ 60,000 _____ for information about the killer.
6. People generally think that smoking is a bad ______ .