Students in Dingli Senior High School are walking along the street, _____ a small red flag.
——I must apologize for _______ ahead of time.——That's all right.
If you had not helped them, they ______ in London now.
A piece of ______ music will make you happy.
Greatly ______, the students made up their minds to work at English even harder.
——Thank you for your help. ——________.