单项选择题
"The ceremony has already started." "Look! The flag（）now."
A.is being raised B.is risen C.is being rose D.is raising
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. ----（）
单项选择题 The world's supplies of copper（）
