It was in the lab was in the charge of Mr white they did the experiment.
A．Where; what B．which; that
C．that ; where D．that ; which.
of the speech, he took out his novel to read.
A．Tires; tired. B．Tired; tires
C．Tired; tiring D．Tiring; tired
At the end of last class, the English teacher requested that the homework this morning.
A．handed in. B．be handed in
C．would be handed in. D．had handed in.
A number of methods been used, but the number of animals still small in the forest.
A．have; is B．has; is
C．have; are D．has; are
If ,the experiment will be successful.
A．do carefully. B．did carefully.
C．carefully done. D．doing carefully.
such heavy pollution already, It may now be too late to clean up the river.
A．Suffering. B．Having suffered. C．To suffer. D．Suffered.
