Acknowledgements
Editorial Management: Pablo Fernández de Córdoba and Isabel Gallardo
Freelance Editing: Paula González Fernández
Production Project Coordinator: Nikhita Chiranjeevi
Book design and page make-up: Pentacorbig and Darío Pérez; Blooberry Design; We Are Bold
Cover design: Chefer and Abel Gantoff Sosa; Blooberry Design; We Are Bold
Audio recordings: Kite Recording Studio; Bendito Sonido; Ian HarKer and Robert Lee
The authors and publishers acknowledge the following sources of copyright material and are grateful for the permissions granted. While every effort has been made, it has not always been possible to identify the sources of all the material used, or to trace all copyright holders. If any omissions are brought to our notice, we will be happy to include the appropriate acknowledgements on reprinting and in the next update to the digital edition, as applicable.
Key: U = Unit
Vocabulary Worksheets
U1: Oleg GawriloFF/Shutterstock; Fernando Blanco Calzada/Shutterstock; Maxx-Studio/Shutterstock; keellla/Shutterstock; Jiri Hera/Shutterstock.
Abhijeet Sharma; Achinto Chatterjee; Andrew Hennessey; Anna Hancock (Diggory); Ben Hasler (NB Illustration); Bernice Lum; Clive Goodyer; Dan Widdowson; Danish Zaidi; Darío Pérez Catalán; David Semple; El Ojo del Huracán; Ishan Varma; José Antonio Rubio; Kay Jackson (Bright); Mar Villar.; Marek Jagucki; Pablo de Pedro; Pablo Rosendo;
Grammar Worksheet
Abhijeet Sharma; Achinto Chatterjee; Andrew Hennessey; Anna Hancock (Diggory); Ben Hasler (NB Illustration); Bernice Lum; Danish Zaidi; David Semple; El Ojo del Huracán; Ishan Varma; Kay Jackson (Bright); Mar Villar; Marek Jagucki; Pablo Rosendo;Clive Goodyer; Pablo de Pedro;
Culture Worksheet
All the photos are sourced from Getty Images.
Bedouins: hadynyah/iStock/Getty Images Plus; Pancake day: whitemay/DigitalVision Vectors; Eric Audras/ONOKY Sport in Brazil: CHRISTOPHE SIMON/AFP.
Festivals
All the photos are sourced from Getty Images.
April Fool's Day: Aquir/iStock/Getty Images Plus; JoyTasa/iStock/Getty Images Plus; Matt Hansen Photography; Dynamic Wildlife Photography/Moment; Larry Washburn; Theo Allofs/Corbis/Getty Images Plus; Charlene Kibbons/EyeEm; Still Images/Photographer's Choice/Getty Images Plus; ru3apr/iStock/Getty Images Plus; jamtoons/DigitalVision Vectors; Thanksgiving: AlonzoDesign/DigitalVision Vectors; bubaone/DigitalVision Vectors; Valentines: UteHil/DigitalVision Vectors; J614/DigitalVision Vectors; RobinOlimb/DigitalVision Vectors; South_agency/DigitalVision Vectors.
Projects
Clocks and watches of the future: Science Photo Library; Creative Crop/DigitalVision; Creativ Studio Heinemann; Kalulu/iStock/Getty Images Plus; Women Scientists: Bettmann; Donaldson Collection/Michael Ochs Archives; Hulton Archive; Pascal Le Segretain/WireImage; Alberto E. Rodriguez/Getty Images Entertainment; Etienne DE MALGLAIVE/Gamma-Rapho; NASA/Donaldson Collection/Michael Ochs Archives; Francis Tsang/Cover; Fotonoticias/WireImage.
La Cosmonauta
Home Booklet
p. 7 (Barcelona): nito/Shutterstock; p. 7 (sculpture): Patrick Ward/Corbis/VCG/Corbis Documentary/GettyImages; p. 7 (miró mosaic): Fernando Vazquez Miras/Moment/GettyImages; p. 7 (man photographing): filadendron/E+/GettyImages; p.10 (woman reading): SeanShot/E+/GettyImages; p. 13: billy bonns/Shutterstock; p. 15: Marc Romanelli/Blend Images/GettyImages; p. 16 (krill): Wolfgang Kaehler/LightRocket/GettyImages; p. 16: MR1805/GettyImages; p. 19 (smartphone1): ET-ARTWORKS/DigitalVision Vectors/GettyImages; p. 19 (smartphone2): BeholdingEye/E+/GettyImages; p. 19 (smartphone3): hudiemm/E+/GettyImages; p. 22: Stocktrek Images/GettyImages; p. 25: Andrey Starostin/Shutterstock; p. 25 Aksenova Natalya/Shutterstock; p. 25: Kletr/Shutterstock; p. 25: Rob Swanson/Shutterstock; p. 28 (elephant): rodwey2004/Moment/GettyImages; p. 31 (hiking): SuHP/Cultura/GettyImages; p. 31 (girl exercising), p. 31 (kids exercising): Hero Images/GettyImages; p. 31: Patryk Kosmider/Shutterstock.
Front cover photography by Johan Larson/Shutterstock; maxpro/Shutterstock; Edrich/Shutterstock; Alex Staroseltsev/Shutterstock; guteksk7/Shutterstock; irin-k/Shutterstock.