instruction:
In this task, a passage will be given and the goal is to generate a question about temporal relations based on that passage. A temporal relation describes the relation between two things with respect to time e.g., something happens/starts/terminates/... immediately/shortly/usually/... before/after/during/... something else.
 Your question should include an event, or ask about an event, and should not be a yes/no question.
question:
Passage: Food chains from farm fields to table are polluted from time to time and environmental pollution has a bad impact on food sources, " according to the plan. His call follows a scandal this month in which red-yolk salted duck eggs were found containing the carcinogenic industrial dye, Sudan-IV, raising nationwide concern over food safety.
answer:
What event has already finished?


question:
Passage: In national over-the-counter trading, LIN shares soared $4.625 to closed at $112.625, while McCaw fell $2.50 a share to $37.75. The proposed BellSouth-LIN cellular company, including the newly acquired Metromedia stake, would give the new entity 55 million potential customers, including about 35 million in the nation's top 10 markets.
answer:
What event has already happened?


question:
Passage: The UN-proposed referendum would determine whether Western Sahara should become part of Morocco or an independent state. With a UN-monitored ceasefire holding since 1991, a resolution to the conflict which has festered for 22 years since Spain's withdrawal from the territory has been put on the international community's back burner for the past year.
answer:

What event has already finished?


