________you can pass the exam or not depends on yourself.
| A．What | B．That | C．How | D．Whether |
A recent research shows that there _____ volcanic activities on the moon and Mars. However, they no longer exist now.
| A．had been | B．has been | C．were | D．would be |
If she had known what lay ____ for her, she would never have agreed to go.
| A．in demand | B．in debt |
| C．in place | D．in store |
The frozen waterfall has attracted floods of tourists to ____ the natural beauty.
| A．cherish | B．admire | C．observe | D．discover |
Although he has become wealthy, Mr. Wood remains _______ he used to be, modest and friendly.
| A．that | B．how | C．who | D．what |
Modern plastics can _________ very high and very low temperatures.
| A．stand | B．keep | C．hold | D．remain |