The telephone ____ , but by the time I got indoors , it stopped .
| A．had rung | B．was ringing | C．rings | D．has rung |
Water can absorb and give off a lot of heat without big changes in temperature, thus creating a ______environment.
| A．stable | B．sensitive |
| C．common | D．peaceful |
A modern city has been set up in _________ was a wasteland ten years ago.
| A．what | B．which | C．that | D．where |
Don’t be ________ by products claiming to help you lose weight in a couple of weeks.
| A．taken off | B．taken in |
| C．taken away | D．taken out |
Meeting my uncle after all these years was an unforgettable moment, ________ I will always treasure.
| A．that | B．one | C．it | D．what |
It is pretty well understood_______ controls the flow of carbon dioxide in and out the atmosphere today.
| A．what | B．when | C．that | D．how |