Professor Smith is now ________ the company, which was once________ Professor White.
| A．in charge of; in charge of | B．in charge of; in the charge of |
| C．in the charge of; in the charge of | D．in the charge of; in charge of |
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 |
The process of curing a disease is like a war ___ different soldiers fight against an enemy.
| A．when | B．where | C．what | D．that |