Age ---- causes a physical decline and our risk of developing certain diseases such as heart disease and osteoporosis increases.

Walter Dill Scott of Northwestern University suggested that advertisers ---- certain fundamental principles on which ---- a rational theory of advertising.

Ever since psychologists started studying intelligence, ----.

Languages differ from one another in innumerable ways, but just because people talk differently does not necessarily mean they think differently.

Robin: – Do you know that when Belgian astronomer Georges Lemaitre suggested that the Universe is expanding, many physicists, including Einstein, rejected his theory?

Douglas: – ----

Robin: – No, not at the beginning. Einstein was at first convinced that the Universe was static. But later, after the introduction of more advanced telescopes, he changed his mind and accepted Lemaitre's theory.

Douglas: – Well, at least he had the wisdom to correct his mistake. Many scientists insist on their misconceptions despite a lot of counter evidence.

---- Infants as young as 6 months show interest in and positive behaviours towards other babies, and as infants develop, their interactions with peers become more frequent and more complex. During the preschool years, peer interactions continue to grow in frequency and complexity. Relations with peers become more differentiated, and symbolic forms of interaction begin to predominate over physical ones.

(I) The World Health Organisation estimates that 246 million people have poor vision. (II) Among these, almost 90 percent live in low-income areas without good access to health care or expensive diagnostic machines. (III) To solve this problem, a private laboratory has combined a tool often used for eye tests into a single inexpensive and portable device. (IV) Fitting people for glasses is also important, but it is only half of the battle. (V) It calculates whether someone is shortsighted by measuring the size and shape of their eyes.

Adult education has now become so important a feature of societies that it increasingly attracts more attention of sociologists, politicians, and businesses.