With prices _____ so much, it's hard for the company to plan a budget.
| A．fluctuating | B．waving | C．swinging | D．vibrating |
As we all know, smoking ___________ people’s health.
| A．is harmful to | B．do harm fo | C．does harmful to | D．harm |
_____ you have worked out the first problem, you may go on to work on the second.
| A．Even if | B．Unless | C．Now that | D．Though |
Most of the evidence was destroyed in the fire. _____, it would be almost impossible to prove Jim guilty.
| A．Anyhow | B．However | C．Besides | D．Thus |
_____ life exists on any other planet in the solar system still remains a question.
| A．Why | B．Whether | C．How | D．Where |
It was almost midnight when a fire _____ in the neighborhood.
| A．blocked out | B．turned out | C．broke out | D．died out |