She got a red bike on her_________ birthday.
______ the students were when they heard the rock music!
______ you keep trying till the end, you will never know how strong you are!
---Look! The light is still on. Is Mr Wu working in his office? ---No, it _____ be Mr Wu. He has gone to Nanjing for a meeting.
The fire lasted half an hour before it was ______ by the firemen.
--- Do you like vegetable salad? --- Yes, it ____ so nice! I’d like to have some more.