Without your help, I _____such a breakthrough in this project.
| A．hadn't made | B．didn't make |
| C．won't have made | D．wouldn't have made |
Food prices are climbing around the world because farmers can't ____ demand for grain．
| A．catch up with | B．keep up with |
| C．grow out of | D．put up with |
Most of the professors _____ to our school were from South Africa．
| A．invited | B．to be invited |
| C．being invited | D．had been invited |
The single most important factor ____ contributes to success is _____ you do every single day．
| A．that; that | B．which; what | C．which; what | D．that; what |
You may drop in or just give me a call. __________ will do.
| A．Either | B．Each | C．Neither | D．All |
Both sides have accused __________ of breaking the contract.
| A．another | B．the other | C．neither | D．each |