单项选择题
The river （） to the east. It is the second longest river in the country.
A.runs B.is running C.run D.ran
单项选择题 "The ceremony has already started." "Look! The flag（）now."
单项选择题 I feel it's an honor（）to attend the opening ceremony of the new bank.
单项选择题 ---- I do apologize for knocking you down. ----（）
