According to the United Nations, an aging society refers to one ____ 10 percent or more of the population is over 60, or 7 percent or more is over 65.
| A．where | B．when | C．which | D．that |
You have to wait till tomorrow when our manager ____ back.
| A．will come | B．comes | C．came | D．come |
E-Mail is a _____of communication and it is becoming more and more popular.
A. type B. meanC. meansD kind
------ What happened to you yesterday evening? Why didn’t you finish your work?
------____ the lights off, we could not continue our work. As a result, we had to leave.
| A．Until | B．Because | C．With | D．As |
The police were seeking more information to find out ____ the rich film star.
| A．who was it that killed | B．who it was that killed |
| C．it was who killed | D．who was it killed |
. Between the two roads ____ a TV tower called "Skyscraper Tower".
| A．stands | B．standing | C．which stands | D．stand |