It is believed that a new kind of drug ______ by the scientists and they are hopeful that they will succeed in a few months.
| A．has been developed | B．is being developed |
| C．is developing | D．has developed |
.
The building burnt down in a big fire. _________was the base on which it stood.
| A．What remained | B．All remained |
| C．What was remained | D．All what remained |
.
If a computer crashes, you will lose the file you _________unless you save it regularly.
| A．are working | B．work | C．will work | D．worked |
.
The driver _________, according to the newspaper, to have been killed in the traffic accident.
| A．said | B．was saying | C．was said | D．had been said |
.
The custom of giving gifts at Christmas can be traced back to the Wise Men _________gifts to the baby Jesus.
| A．bring | B．brought | C．bringing | D．being brought |
.
_________at the very beginning, the financial crisis was getting worse and worse in America.
| A．Not dealt with properly | B．Not dealing with properly |
| C．Not having dealt with properly | D．Not being dealt with properly |