Single-family home sales and prices in Massachusetts fell 1.5 percent in March, capping a first quarter in which sales slowed dramatically from the previous year... ''Inventory is at record highs, so buyers are taking their time," said David Wluka, president of the Massachusetts Association of Realtors. ''They can pick among several houses so they don't feel the pressure." The slowdown in Massachusetts' housing market ran counter to a surprising pick-up in March in nationwide sales of homes, condominiums, and townhouses. Analysts had predicted that strong February sales... The housing market in Massachusetts ''simply isn't as strong as it is in...