Choose the best sentence or phrase from the list A~F. (There is one extra item.) For gaps 1~5, mark one letter (A~F) to fill each of the gaps. Do not mark any letter twice. Packaging of commodities is generally divided into transport packing (also called outer packing) and sales packing (also called inner packing). The third kind of packaging, neutral packing is also often used in international trade. Transport packaging is mainly to keep the goods safe and sound during transportation. It must not only be solid enough to 4.___________, but also be pilferage-proof, easy to store, convenient to load and unload.