You will be given three sentences. Read them, then identify a noun phrase (person, place, or thing) or event that is shared between all three sentences. As the output, write the span of the text corresponding to that phrase in each sentence. Keep the order of the sentences, that is, your answer should look like: 1: *a phras from sentence 1e* 2: *a phras from sentence 2* 3: *a phrase from sentence 3*

1: Before last week 's blast , the restaurant 's owner had smelled gas and contacted the building 's owner , but did n't contact authorities . 2:  They should have called 911 ,  he said . 3: Emergency commissioner : Restaurant owner smelled gas , but did n't call 911 .
1: authorities 2: 911 3: 911

1: But as with any potential threat to human health , they are preparing for the worst just in case . 2:  The risk to humans is low , our food supply is safe ,  said Dr . John Clifford , the USDA 's Chief Veterinary Officer . 3: The CDC says  the risk to humans is low ,  but , as always , they are preparing for the worst case .
1: they 2: USDA 3: The CDC

1: Houthi supreme leader Abdul Malik al-Houthi spoke live Thursday night in Yemen on al-Masirah TV , saying ,  If any army try to invade our country , we will prove that Yemen will be a grave for those who invade us .  2: He added ,  We call on the invaders to stop the attacks and if the airstrikes do not end then we will escalate in the needed manner .  3: Houthi leader says rebels will escalate response if airstrikes continue , make Yemen a grave for Saudis .

1: Houthi supreme leader Abdul Malik al-Houthi 2: He 3: Houthi leader