Stocks ended a wobbly day with modest gains, enough to send the Dow Jones Industrial Average to its first close above 29,000 points, two months after its first close above 28,000. Traders were hopeful that the signing of a preliminary trade deal between the US and China Wednesday would help bring about better relations between the two economic superpowers. Health care stocks led the gains, the AP reports. UnitedHealth rose after reporting solid earnings. The S&P 500 rose 6 points, or 0.2%, to 3,289. The Dow added 91 points, or 0.3%, to 29,030. The Nasdaq rose 7 points, or 0.1%, to 9,258. Bond yields fell. (More stock market stories.)