I admire my English teacher. I can remember very few occasions ________ she stopped working because of ill health.
A．that B．when C．where D．which
—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
