Provided by Dow Jones By Colin Kellaher Services activity in the middle of the U.S. continued to improve in April, and expectations for future activity also rose, according to the Federal Reserve Bank of Kansas City. The Tenth District Services Survey's composite index, a weighted average of indexes covering revenue/sales, employment and inventory, came in at 20 for April, compared with readings of 22 in March and 1 in February. Readings above zero indicate expansion, while those below zero indicate contraction. The Kansas City Fed said its general revenue and sales index remained high in April, helped by more wholesale, retail, tourism and restaurant activity, while auto and real-estate activity fell slightly.