短文听力填充(2): One of the most significant _____________1 of aircraft design is CG. It is the _____________ 2 point where the mass or weight of an aircraft may be said to center; that is, a point around which, if the aircraft could be suspended or ___________3, the aircraft would remain relatively level. The position of the CG of an aircraft determines the _____________4 of the aircraft in flight. As the CG moves _____________ 5 the aircraft becomes more and more dynamically unstable. In aircraft with _____________ 6 situated in front of the CG, it is important that the CG is set with the fuel tank empty. Otherwise, as the fuel is used, the aircraft becomes unstable. The CG is _____________ 7 during _____________ 8 design and construction, and is further affected by the _____________ 9 of onboard equipment, aircraft _____________ 10, and other factors.