A large quantity of information, as well as some timely help, ______ since the organization was built.
| A．has offered |
| B．had been offered |
| C．has been offered |
| D．is offered |
7. No one but her parents _____ it.
| A．know | B．knows | C．is knowing | D．are knowing |
6. The Olympic Games _____ held every _____ years.
| A．is; four | B．are; four | C．is; five | D．are; five |
5. About 40 _____ of the population of that country _____ on farms.
| A．percent; lives | B．percent; live | C．percents; live | D．percents; lives |
4. _____ can be done _____ been done.
| A．All; have | B．All that; have | C．All; has | D．All that; has |
3. He played on the _____ for two hours and when he returned he found half his goods _____ stolen.
| A．sand; were | B．sand; was | C．sands; were | D．sands; was |