Task 10 Vocabulary Listen and complete the notes. Swimmers and other 1._______ are always trying to swim faster, using less energy. To do this, they must wear clothes which produce very little friction, or 2._________, when they move through the air or water. Scientists who 3._______ these clothes have studies some of the fastest fish in the sea, sharks. They have copied the skins of these animals and invented a material which reduces 4._________. the result is that swimmers can swim even faster and be more energy 5.________.