In the following question, a sentence with 2 blanks is

Solution

The sentence states that a state of emergency has been imposed on multiple Greek islands due to a series of undersea earthquakes. The phrase "has been" suggests that the correct verb should be in its past participle form. Thus, option 2 gets ruled out. "Declared" fits well because a state of emergency is typically declared by authorities, making it the most appropriate choice. Other options like "announced" (which is used for general information rather than official enforcement), "ordered" (which is more directive), and "sufficed" (which does not fit contextually) are incorrect.The second blank describes the series of undersea earthquakes."Swarm" is the correct choice because a swarm of earthquakes refers to a cluster of seismic activities occurring over a period. Other options like "surge" (which refers to a sudden increase but is not commonly used for earthquakes), "cascade" (which implies a sequential flow rather than simultaneous activity), "tremor" (which refers to a single earthquake, not a series), and "outbreak" (which is typically used for diseases) do not fit.Therefore, option 4 (declared, swarm) is the right answer.