Unit 7 - Word formation

Jogging is a very ___ form of exercise. (energy)

___, the mummy got up and smiled at the viewers. (sudden)

It was ___ that I did badly in the exam. (disappoint)

___ air is one of the many problems we have to solve. (pollute)

Clean water is an absolute ___. (necessary)

Customers made a formal ___ about the way they were treated. (complain)

She ___ refused his invitation. (polite)

We meet ___ each morning for coffee. (regular)

Scientists are looking for an ___ way reduce energy consumption. (effect)

A helmet affords the cyclist some degree of ___ against injury. (protect)