| A.cheaper than the new oil | B.more quickly |
| C.more expensive | D.as good as the new oil |
| A.more expensive than fish oil, but better |
| B.less expensive, and better |
| C.less expensive, but not good |
| D.more expensive, and not so good |
| A.to produce it himself |
| B.to prevent it being produced |
| C.to be paid not to produce it |
| D.the manager to produce it |