Stop cutting trees, ________ the earth will become worse and worse.
| A．and | B．then | C．but | D．or |
Only after reaching eighteen join the army.
| A．have you; you can | B．have you; can you | C．you have; you can | D．you have; can you |
The students on the professor’s lecture now and then.
| A．took note | B．took notes |
| C．took notice | D．took action |
The house built of stone lasts longer than ____ built of wood.
| A．the one | B．one | C．that | D．its |
It is ______ that terrorism is a great threat to world peace.
| A．widely accepted | B．widely accepting |
| C．wide accepted | D．wide accepting |
With the worldwide oil crisis, the price of oil has been raised ______
15%.
| A．about | B．with | C．of | D．by |