28. The Hotel Al Arab, ______ the first and only 7-star hotel in the world, was designed in the shape of a sail of 321 meters.
| A．having been considered | B．considering | C．being considered | D．considered |
The death rate is __________ pigs and recovery usually __________ within 7—10 days.
| A．low in; occurs |
| B．rich in; happens |
| C．high in; came about |
| D．poor in; took place |
__________ is certain is __________ prevention is more important than treatment.
| A．It; that |
| B．What; that |
| C．As; what |
| D．What; what |
I asked him __________ we had to go. He told me just two more miles.
| A．how much longer |
| B．how much farther |
| C．how long |
| D．how far |
__________ in the regulations that you should not tell other people the password of your e-mail account.
| A．What is required |
| B．What requires |
| C．It is required |
| D．It requires that |
The chief manager has decided to put __________ he thinks is energetic, clever and capable to the position of the leadership of the company.
| A．whatever |
| B．whoever |
| C．whichever |
| D．whomever |