In this task, you will be given a passage to read. A fill in the blank question will be given to you.  Your answer should fit the blank appropriately.
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Question:  In 1994 , two years after Fey joined Chicago 's Second City improvisational theatre troupe , she began dating Jeff Richmond , a piano player who later became Second City 's musical director and then a composer on 30 Rock . They married in a Greek Orthodox ceremony on June 3 , 2001 . They have two daughters : Alice Zenobia Richmond ( born September 10 , 2005 ) and Penelope Athena Richmond ( born August 10 , 2011 ) . In April 2009 , Fey and Richmond purchased a US $ 3 @.@ 4 million apartment on the Upper West Side in New York City . Fey has a scar a few inches long on the left side of her chin and cheek , the cause of which remained unexplained to the public until a 2008 Vanity Fair profile by Maureen Dowd , and subsequently in her autobiographical book , where she revealed that during the spring semester of kindergarten , I was slashed in the face by a stranger in the alley behind my house. fill in the blank  :  In 1994 , two years after Fey joined Chicago 's Second City improvisational theatre troupe , she began dating Jeff Richmond , a piano player who later became Second City 's musical director and then a composer on __________________ Rock . 

Answer:  30 


Question:  Under CAA and EASA rules , all aircraft are required to meet certain standards of airworthiness to fly safely and legally . Aircraft that meet these standards are issued with a Certificate of Airworthiness . However , British @-@ registered aircraft which are excluded from the scope of EASA , and which cannot satisfy the requirements for the issue of a Certificate of Airworthiness , may be issued with a Permit to Fly . This allows them to fly in UK airspace subject to certain limitations , for example being restricted to day @-@ time flights under visual flight rules only . A number of organisations ( e.g. the British Microlight Aircraft Association and the Light Aircraft Association ) have obtained a standing over @-@ flight permission for Permit to Fly aircraft within their area of interest with some European countries , notably France . Permits are typically issued to vintage and historic aircraft , amateur built aircraft , and microlights . fill in the blank  : Under CAA and EASA rules , all aircraft are required to meet __________________ standards of airworthiness to fly safely and legally . 

Answer:  certain 


Question:  The reaction mechanism for the Johnson – Corey – Chaykovsky reaction consists of nucleophilic addition of the ylide to the carbonyl or imine group . A negative charge is transferred to the heteroatom and because the sulfonium cation is a good leaving group it gets expelled forming the ring . In the related Wittig reaction , the formation of the much stronger phosphorus @-@ oxygen double bond prevents oxirane formation and instead , olefination takes place through a 4 @-@ membered cyclic intermediate . The trans diastereoselectivity observed results from the reversibility of the initial addition , allowing equilibration to the favored anti betaine over the syn betaine . Initial addition of the ylide results in a betaine with adjacent charges ; density functional theory calculations have shown that the rate @-@ limiting step is rotation of the central bond into the conformer necessary for backside attack on the sulfonium . The degree of reversibility in the initial step ( and therefore the diastereoselectivity ) depends on four factors , with greater reversibility corresponding to higher selectivity : Stability of the substrate with higher stability leading to greater reversibility by favoring the starting material over the betaine . Stability of the ylide with higher stability similarly leading to greater reversibility . Steric hindrance in the betaine with greater hindrance leading to greater reversibility by disfavoring formation of the intermediate and slowing the rate @-@ limiting rotation of the central bond . Solvation of charges in the betaine by counterions such as lithium with greater solvation allowing more facile rotation in the betaine intermediate , lowering the amount of reversibility . fill in the blank  :  The reaction mechanism for the Johnson – Corey – Chaykovsky reaction consists of nucleophilic addition of the ylide to the carbonyl or __________________ group . 

Answer:
 imine 


