We are not ready to go into production yet. The new machine isn’t fully _____.
| A．worked out | B．turned out | C．left out | D．tested out |
Mark drives his car too fast and, what's more, very carelessly, ________ worries his mother.
| A．a | B．what |
| C．it | D．which |
Occasions are quite rare ________ I have the time to spend a day with my kids.
| A．who | B．which |
| C．why | D．when |
The three backpackers finally reached the top of Mount Huangshan, ________ they could enjoy the breathtaking sights to their heart's content.
| A．when | B．where |
| C．why | D．how |
Europe has achieved more in controlling the AIDS virus than Asia in the past ten years, ________ the number of people infected with the virus is going up sharply.
| A．when | B．that |
| C．so that | D．where |
With the development of agriculture, the people ________ village I taught are now living a happy life.
| A．in whose | B．whose |
| C．in which | D．which |