根据《招标投标法》的规定，（）应当对所有在投标文件截止时间之前收到的合格的投标文件，在开标现场当众拆封。

A.投标人或者其推选的代表

B.公证机构工作人员

C.评标委员会工作人员

D.招标人或者其委托的招标代理机构的工作人员

1.Millie often practise _________________ volleyball (play)

2.September 10 is _________________ Day.(teach)

3.Simon is busy __________________ his homework now.(do)

4.Please ___________________ the window. It's cold.(close)

5.Some people don't know how _________________ fun.(have)