There are many ___1____ of transportation, and each has its _____2_______. Goods can be transported by a train, a truck, a plane, a ship or through a ___3____. The method used __________ time and cost. Trains are usually used to transport ___4____ products that are low in value and must travel great distances. Trucks can stop within a city and deliver goods direct to the market. A truck can start ___5____ it is loaded. It is mostly used to transport high-value goods which travel short distances. Air freight is quick although it is expensive. When speed is ________6___________, this method will be more effective. Food and some urgently needed goods are usually delivered by air freight. Ships have long been used for transportation. They are still the most important means of transportation in international trade now. _____7______ such as coal, grain, chemicals and iron ore are often shipped by this means. Although it is a little slower, ith is much less expensive. So far, most of our export goods have been transported by ship. ____8___ China began its reform, wee have had many busy ports with great ____9______ . Almost 80% of our import and export goods are handled through these ports. Pipelines are a special ___10_____of transportation. This form is ___11___ used for transporting gasoline, crude oil, and natural gas. Even some __12____ can be moved by pipelines. With the ___13_____ of international trade, the container service has become popular. The use of containers provides a highly ___14____ form of transport by road, rail and air, which has been ___15____ a mode of more efficient shipment.