I_______________ that all windows are shut. I did it.
| A．make sure | B．am sure | C．make clear | D．am clear |
The candidate was about to get in the car _ suddenly a man with a mask appeared and shot at him.
| A．while | B．after | C．as | D．when |
___ was obvious ___ manager of the coffee shop was waiting for Li Fang to leave.
| A．This; because | B．It; when | C．That; that | D．It; that |
Prices of daily goods ____ through a computer can be lower than store prices.
| A．are bought | B．bought | C．been bought | D．Buying |
Tom was about to close the window ___ his attention was caught by a bird.
| A．when | B．if | C．and | D．till |
Well, towards nightfall, I found myself ___ out to sea by a strong wind.
| A．being carried | B．carried | C．to carry | D．having carried |