Be sure to make the invitations sent to ____ has taken part in the competition.
| A．who | B．whom | C．whoever | D．whomever |
The manager said to the employees at the meeting that everyone must___their attention to efficiency
| A．concertrate |
| B．focus |
| C．pay |
| D．fix |
Large quantities of cotton___shipped all over the world already.A large quantity of bamboo___used for pipes to carry water
| A．has been;are |
| B．has been;is |
| C．have been;is |
| D．have been;are |
___houses were knocked down in the earthquake
| A．A great many |
| B．The number of |
| C．A great many of |
| D．A great deal of |
___in the regulation 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 |
Most people would agree that nuclear science should be developed to benefit the human beings___harm them
| A．more than |
| B．other than |
| C．less than |
| D．rather than |