Contemplate the data and tweets to guess whether the closing price of $mrk will surge or decline at 2017-08-02. Please declare either Rise or Fall.
Context: date,open,high,low,close,adj-close,inc-5,inc-10,inc-15,inc-20,inc-25,inc-30
2017-07-19,-0.2,0.3,-0.3,0.3,0.3,0.2,0.3,1.1,2.1,2.0,1.9
2017-07-20,-0.0,0.5,-0.1,0.5,0.5,-0.3,-0.3,0.4,1.4,1.4,1.3
2017-07-21,0.3,0.6,-0.1,-0.5,-0.5,0.0,0.1,0.7,1.6,1.9,1.8
2017-07-24,-0.0,0.5,-0.1,-0.1,-0.1,0.1,0.2,0.6,1.4,2.0,1.9
2017-07-25,0.8,1.0,-0.2,-0.3,-0.3,0.4,0.5,0.8,1.5,2.2,2.1
2017-07-26,0.8,0.9,-0.1,-0.9,-0.9,1.1,1.3,1.4,2.1,3.0,3.0
2017-07-27,-0.0,1.4,-1.4,3.1,3.1,-1.7,-1.6,-1.5,-1.0,-0.2,-0.1
2017-07-28,-0.5,0.4,-1.4,0.7,0.7,-1.9,-2.1,-2.1,-1.7,-0.9,-0.7
2017-07-31,0.6,0.7,-0.6,-0.4,-0.4,-1.1,-1.5,-1.6,-1.4,-0.7,-0.3
2017-08-01,0.2,0.5,-0.2,0.1,0.1,-0.7,-1.4,-1.5,-1.5,-0.9,-0.3

2017-07-19: here are the biggest factors weighing on the drugmakers targeting alzheimer's disease  $agn $biib $lly $mrk|$spy #healthcare 32 #millions more #uninsured means no money at these 'record highs' $xlv $i
2017-07-20: johnson &amp;amp; johnson stays healthy in 2q17  $jnj $xlv $pfe $mrk|merck &amp; company, inc. $mrk downgraded to ¡°strong sell¡± at bidaskclub |wouldn't be out of question in my opinion to see these 
2017-07-21: fda grants tentative approval for $mrk's lusduna nexvue |rt AT_USER merck reports #hbv #vaccine shortage¡ú via AT_USER AT_USER $mrk $gsk #hepb |rt AT_USER merck reports #hbv #vaccine shortage¡ú via AT
2017-07-22: commented on 3 things in biotech you should learn today: july 22, 2017  $cslly $incy $mrk|merck &amp; company, inc. $mrk rating lowered to strong sell at bidaskclub |cullen frost bankers inc. has $13.
2017-07-23: #allergan changes severance plan for senior management! $agn $myl $mrk $twtr $aapl $crm $msft $brk $iep $jazz $nflx¡­ |dr. promoting #botox for depression without AT_USER approval! $agn $ibm $pep $brk
2017-07-24: merck #immunotherapy drug fails key clinical trial in head-and-neck #cancer  via AT_USER $mrk|rt AT_USER let¡¯s all bookmark tonight¡¯s bio-twitter $mrk apologia for keytruda failure when the confirma
2017-07-25: rt AT_USER AT_USER AT_USER everybody in t-cell immunotherapies should be interested in $afmd for its nk-cell engagers imo - afm¡­|$mrk's keytruda misses in head and neck cancer |no apples &amp; in you
2017-07-26: rt AT_USER merck &amp; co. $mrk plans to file nda for hiv treatment doravirine based on phase iii results  |the surprising history behind $mrk's cancer blockbuster:  by dshaywitz  by forbeshealth|$fb 
2017-07-27: rt AT_USER let¡¯s all bookmark tonight¡¯s bio-twitter $mrk apologia for keytruda failure when the confirmatory study of $srpt etepli¡­|rt AT_USER oh the irony. $mrk partners its parpi (mk2512) to $tsr
2017-07-28: invenra signs on with merck in antibody discovery partnership $mrk  AT_USER|#amreading merck hacked, says profits impacted for remainder of year $mrk |rt AT_USER astrazeneca shows the peril of going a
2017-07-29: spirit of america management corp ny has $840,000 position in merck &amp; company, inc. $mrk |spirit of america management corp ny has $840,000 position in merck &amp; company, inc. $mrk |merck &amp; 
2017-07-30: merck &amp; company, inc. $mrk issues quarterly  earnings results, beats expectations by $0.14 eps |merck &amp; company, inc. $mrk posts  earnings results, beats estimates by $0.14 eps |merck &amp; co
2017-07-31: henderson group plc boosts position in merck &amp; company, inc. $mrk |henderson group plc boosts position in merck &amp; company, inc. $mrk |united fire group inc. holds stake in merck &amp; company,
2017-08-01: traders sell shares of merck &amp; company, inc. $mrk on strength $mrk |traders sell shares of merck &amp; company, inc. $mrk on strength $mrk |merck &amp; company, inc. $mrk shares bought by xact kap
Answer:
Fall