. Social networking is an important factor _______ business success.
| A．devoting to | B．appealing to | C．attaching to | D．leading to |
—Did you know more about the mine accident?
—Oh，sorry，I had no idea. I ________ the Rescue Center now.
| A．will be phoning | B．am to phone |
| C．will phone | D．phone |
—________ you interrupt now? Can't you see I'm on the phone?
—Sorry Sir, but it's urgent.
| A．Can | B．Should | C．Would | D．Must |
As is reported, it will be more than 20 years ________ humans are able to walk on Mars.
| A．before | B．when | C．since | D．after |
Be careful that a good name of a product doesn't ________ mean good quality of it.
| A．alternatively | B．approximately |
| C．obviously | D．necessarily |
The supermarket rules state that no goods ________ be taken out of the supermarket, ________ paid for by the shopper.
| A．must; once | B．should; when |
| C．can; if | D．shall; unless |