SPELLING

Ex 4.21 Circle the correct word (20 pairs):

Scientists may have found one answer to the problem of water shortage / shortages. It is a new material that collections / collects water from the air. They got their idea / ideal from a small beetle that lives in the desert on / in Africa. The deserts of the Skeleton Coast in Namibia are very dry, but the Namib desert beetle is an expat / expert at surviving in hot and dry conditions. Its shell is covered in small bump / bumps that collect tiny water droppings / droplets from the air. The water is enough to keep / kept the beetle alive. Scientists studied the shape and material of the beetle's bumps. They want to use what they found in / out about the beetle to make their own materials that can collect water from the air. This will help people who live in very dry areas / area.

The scientists believe this new / knew technology could help in many areas of our live / life. They said it could be very useful for power plants and for the heating and air conditioned / conditioning in airplanes, cars and trains. One of the scientists, Philseok Kim, said: "Thermal power plants, for example, relay / rely on condensers to quickly convert stream / steam to liquid water. [Our] design could help speed up / out that process and even allow for operation at a higher temperature, significance / significantly improving the overall energy efficient / efficiency." Another scientist, Joanna Aizenberg, said she was looking forward to the past / future of getting ideas for new technologies from nature. She said: "Everybody is excited / excitement about bio-inspired materials research."

Ex 4.22 Talk about the connection between each pair of words in italics, and why the correct word is correct.