（2013·安徽卷)From space, the earth looks blue. This is about seventy-one percent of its surface is covered by water.
| A．why | B．how | C．because | D．whether |
My schedule is very___right now,but I’ll try to fit you in
| A．tight |
| B．short |
| C．regular |
| D．flexible |
It’s no use___without taking any action
| A．complain |
| B．complaining |
| C．being complained |
| D．to be complained |
It was not until I came here___I realized this place was famous for not only its
| A．who |
| B．that |
| C．where |
| D．before |
What shall we use for power when all the oil in the world has___?
| A．given out |
| B．put out |
| C．held up |
| D．used up |
A person___e-mail account is full won’t be able to send or receive any e-mails
| A．who |
| B．whom |
| C．whose |
| D．whoever |