The earthquake in Japan, measuring 9.0 on the Richter Scale, was so violent cause a series of explosions of the nuclear reactors in several power stations.

We are in the ____ school, but in ____ grades.

I took the wrong train .I didn’t even know it until half an hour later. [ ]

_____your composition carefully, some spelling mistakes can be avoided．

All of us are proud _____ the great changes of our hometown. [ ]