E Choose the correct answer. 1 I don't think people should be allowed to perform experiments ........ animals. 2 There was an explosion in technology ........ the beginning of the 20th century. 3 Let's face ........ - we are destroying the environment and we need to do something now. 4 The distance from the Earth to the Sun is, ........ average, about 149 million kilometres. 5 It's amazing that creatures survive ........ the bottom of the ocean. 6 Fox Talbot ........ the first photograph in 1835. 7 Researchers have ........ to the conclusion that your personality is affected by your genes. 8 Do you mind if I just ........ a quick phone call from here? 9 Many lives were saved ........ the introduction of antibiotics. 10 The ........ of the nuclear accident is still unknown. 11 My father works at the university, doing research............. weather control. 12 The telescope will photograph distant galaxies, ........ an attempt to understand their past.