Charles Tillman and Lance Briggs returned interceptions for touchdowns as the Bears blasted the Cowboys, 34-18, on "Monday Night Football."  Jay Cutler threw for 275 yards and two touchdowns for the Bears, who improved to 3-and-1.  Brandon Marshall had seven catches for 138 yards and a score in the win.  Tony Romo passed for 307 yards, a touchdown and five interceptions for Dallas, which dropped to 2-and-2.  Jason Witten had 13 grabs for 112 yards and a TD in the lopsided loss.