Stocks to Watch on Aug. 20  NEW YORK (Reuters) - U.S. stocks to watch: GOOGLE INC.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=GOOG.O target=/stocks/quickinfo/fullquote"&gt;GOOG.O&lt;/A&gt; Google shares jumped 18 percent in their long-awaited  stock market debut on Thursday after a scaled-down \$1.67  billion IPO marked by missteps and lackluster market  conditions. The stock closed at \$100.34.  