Earthquakes can be caused by volcanoes in certain cases. Nuclear explosions under the ground can create waves (17)__________ are very similar to natural seismic waves. The seismic energy (18)__________ in an atomic bomb is one hundred-thousandth that of the largest earthquake.

Earthquakes (19)__________ in all parts of the world. (20)__________ activity occurs along certain belts. 80% of all seismic energy is generated (21)__________ a belt that is found at the border of the Pacific Ocean. A great deal of volcanoes is also found there, and volcanoes (22)__________ many earthquakes. Japan, the Philippine Islands, New Guinea, and New Zealand are all parts of the Pacific belt.

17.    A. who                               B. that                                C. whom                            D. whose
18.    A. create                            B. to create                        C. creating                         D. created
19.    A. take place                      B. take in                           C. take over                       D. take off
20.    A. frequency                      B. frequencies                   C. frequent                        D. frequently
21.    A. for                                 B. in                                   C. from                              D. with
22.    A. set off                            B. set on                             C. set in                             D. set up

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