I counted the people the activity, and there were 286 of them.
A．were taking part in B．taking part in
C．taken part in D．took part in
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
