单句语法填空
① They _____________(settle) in at a comfortable East Side cafe and within minutes, another customer was approaching their table.
② They failed to reach a ____________ settle), because they disagreed too much with each other.
③ ____________ (advance) lights, motors, and building designs have helped save a lot of energy and therefore prevented pollution.
④ Last ____________ (admit) is at 5:00 pm, one hour before closing.