Utilize the data and tweets at hand to foresee if the closing price of $gd will elevate or diminish at 2015-07-21. Only answer with Rise or Fall.
Context: date,open,high,low,close,adj-close,inc-5,inc-10,inc-15,inc-20,inc-25,inc-30
2015-07-07,-0.1,0.0,-1.5,0.2,0.2,-0.5,-0.2,-0.0,-0.5,-1.1,-1.4
2015-07-08,0.3,0.9,-0.3,-1.0,-1.0,0.6,0.6,1.0,0.6,-0.1,-0.3
2015-07-09,-0.1,0.6,-0.1,1.1,1.1,-0.4,-0.6,-0.2,-0.4,-1.1,-1.4
2015-07-10,-0.2,0.6,-0.6,1.5,1.5,-1.5,-1.9,-1.6,-1.8,-2.4,-2.7
2015-07-13,0.7,0.9,-0.2,0.1,0.1,-1.2,-1.9,-1.7,-1.7,-2.2,-2.7
2015-07-14,-0.3,0.5,-0.3,0.5,0.5,-1.3,-2.0,-2.0,-2.0,-2.5,-3.0
2015-07-15,-0.1,0.3,-0.4,0.2,0.2,-0.8,-1.8,-2.1,-2.0,-2.4,-3.0
2015-07-16,-0.3,0.1,-0.5,0.8,0.8,-1.0,-2.2,-2.7,-2.7,-3.0,-3.6
2015-07-17,-0.0,0.1,-1.1,0.1,0.1,-0.8,-2.0,-2.6,-2.7,-2.9,-3.5
2015-07-20,-0.2,0.2,-0.4,0.2,0.2,-0.6,-1.9,-2.7,-2.8,-3.0,-3.5

2015-07-12: gd general dynamics corp. last price$gd $gluu $cost $sh #gd #stocks #pennystocks
2015-07-15: $gd $lmt:boeing, aerospace segment "has legs," j.p. morgan analyst says:
2015-07-16: sds proshares ultra short s&amp;p 500 market cap$sds $nat $gd $kr #sds #stock #invest
2015-07-17: our penny stock picks have gained 3,600% in 9 months! subscribe to get our future picks:  $gd $jnj $mor.de|our platinum subscribers saw their penny stock alerts gain over 350% in 2 weeks! big update: 
2015-07-18: our stock pick on $gequ nearly quadrupled in value in less than 2 weeks! major news:  $gd $jnj $mor.de
2015-07-19: $twtr twitter inc      $syn $mwe $mdxg $dhr $nat $googl $stng $amzn $bsbr $ko $psx $bud $hig $kkr $jnj $sti $gd $wm
Answer:
Fall