－ What does the sign over there read － “No person ________ smoke or carry a lighted cigarette, cigar or pipe in this area”

Which do you think is ________, health or wealth？

以下选项中_____不是设置电子邮件信箱所必需的。

在Outlook Express窗口中，新邮件的"抄送"文本框输入的多个电子信箱的地址之间，应用_____作分隔。

29．__________ when you are on the bus or bike．

Which do you think is _________________important, health or wealth?

Either he or I ______to the airport.

某人的电子邮件到达时，若他的计算机没有开机，则邮件______。

下列用户XUEJY的电子邮件地址中，正确的是______。

Duty is an act or a course of action that people __________you to take by social customs, law or religion.

Hurry up, or you ______ catch the train.

（填空题）电子邮件地址的一般格式为：用户标识@_______表示。