The word "breakthrough" is often used when talking about the newest drug or the next treatment ___ in cancer research．
| A．finding | B．being found | C．to be found | D．found |
The photo was taken ______ stood the famous Bird’s Nest in Beijing during the Olympics.
| A．which | B．in which | C．where | D．there |
I had just stepped out of the bathroom ______ I heard the steps.
| A．while | B．when | C．since | D．after |
This is a very interesting book．I’ll buy it，．
| A．how much may it cost | B．it may cost |
| C．however much it may cost | D．how may it cost |
Parent should take seriously their children’s requests for sunglasses _______ eye protection is necessary in sunny weather.
| A．unless | B．because | C．though | D．so |
--- Do you know the reason _________ pilots turn off the plane’s lights before taking off?
---The practice is for the passengers to adjust to the dark _________ an emergency.
| A．why; for fear that | B．for which; in case of |
| C．how; for fear of | D．that; in case |