EXHIBIT 1.1 VAN KAMPEN UNIT TRUSTS, MUNICIPAL SERIES 718 TRUST AGREEMENT Dated: September 9, 2008 This Trust Agreement among Van Kampen Funds Inc., as Depositor, The Bank of New York Mellon, as Trustee, Standard & Poor's Securities Evaluations, Inc.,...Trust Agreement • September 9th, 2008 • Van Kampen Unit Trusts, Municipal Series 718
