Ocean transport use （）ships mostly. Bulk。 Container。 Barge。 RO/RO。
Crude oil carriers often use （） Big ships。 Huge ships。 Large container ships。 Supertankers。
Water transport is the（） way of shipping bulk and low price goods. Most inexpensive。 Save money。 Low cost。 Economically。
The disadvantage above mentioned can be overcome by （） combined transport。 More frequency。 Fast train。 More flexible。
The disadvantages of rail compared with motor carrier are（） Cost 。 Speed 。 Lost and damage ratios 。 Transit time and frequency of service。
Railroads own about （）of their car fleet.
