招标人最迟应当在书面合同签订后（）内向中标人和未中标的投标人退还投标保证金及银行同期存款利息。
A.5日
B.15日
C.20日
D.21日
参考答案：A
填入正确单词，把下列对话补充完整。
One day, Li Ming, Jenny and Danny went to (去) Tian'anmen Square.
Li Ming: Tian'anmen Square big. There many here.
Jenny: Yes, I see. The children playing. They laughing. Some people walking happily on
the square.
Danny: Some men kites. Let's a kite.
Li Ming: Let's a picture.
海鸥征
