One of the (1) _______ things that can happen on our earth is an earthquake. When earthquakes take place near large cities, many people may be killed and many buildings are knocked down. Fire may start and do more damage than the quake itself. Earthquake comes (2) ______ a shaking of the rocks under the surface of the earth. Forces within the earth push against the rocks until they break. We cannot tell exactly (3) _______ an earthquake is coming, but we can know places on the (4) _______ where they happen most often.

1. A. bad B. badly C. worse D. worst

2. A. to B. from C. through D. in

3. A. while B. when C. before D. after

4. A. world B. country C. earth D. reason