The mysterious death of 85 cows in Ratchaburi in February is believed to ___1___ by the release of toxic chemicals from an illegal factory. Government Agencies ___2___ to solve the crisis ___3___ by focusing on halting the impact on the environment. The factory has been closed ___4___ the mayor's order, but no investigation is in progress ___5___ whether the firm committed any crime.
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cause
being caused
have been caused
be causing