They had kept working for several weeks everything was in order.
A．before B．after C．since D．unless
The headmaster who had the grand ceremony waved to the crowds with a smile .
A．included B．joined C．introduced D．attended
When the market economy is introduced, many factories will not .
A．live B．last C．survive D．keep
This is an illness that can total blindness if it is left untreated.
A．result from B．lead in C．result in D．leave behind
Our chemistry teacher a better way of working out the problem this morning.
A．caught up with B．came up with
C．put up with D．got on with
－What do you think of store shopping in the future?
－Personally, I think it will exist along with home shopping but ______.
A．will never replace B．would never replace
C．will never be replaced D．would never be replaced
