Every possible means ________ to prevent the air pollution , but the sky is still not clear.
| A．is used | B．are used | C．has been used | D．have been used |
In a room above the store, where a party____,some workers were busy setting the table.
| A．was to be held |
| B．has been held |
| C．will hold |
| D．is being held |
The words____if you don't go over them for several days.
| A．will forget |
| B．forgotten |
| C．will be forgotten |
| D．were forgotten |
A talk on American culture____in the school hall this weekend.
| A．is given |
| B．give |
| C．has been given |
| D．will be given |
The class____on everything they havelearned this year.
| A．is going to be examine |
| B．are going to be examined |
| C．is going to be examined |
| D．are going to be examine |
She____for her lost son in the evening paperbut nobody answered her.
| A．advertised |
| B．made |
| C．searched |
| D．allowed |