by a greater demand for green products, the food company has set higher standards to ensure the quality.
| A．Driven | B．Being driven | C．To drive | D．Having driven |
Each statue is of a person who has made a ___ in American history.
| A．difference |
| B．improvement |
| C．significance |
| D．importance |
The official ___ whom we applied ___ a permit was most warm-hearted.
| A．for; for |
| B．to; for |
| C．in; to |
| D．to; with |
Many of the survivors are being ___ burns and other injuries at local hospitals.
| A．treated for |
| B．cured for |
| C．treated as |
| D．cured of |
The number of people who ___ in position of professional skills and knowledge ___ shrinking.
| A．are; is |
| B．is; are |
| C．are; are |
| D．is; is |
The experiment shows that proper amounts of exercise, if ___ regularly, can improve our health.
| A．being carried out |
| B．carrying out |
| C．carried out |
| D．to carry out |