... trying to study for a long period once a week, for example © Cambridge University Press www .cambridge. org Cambridge University Press 978-0-521-70821-0 - Cambridge Vocabulary for PET with Answers ... © Cambridge University Press www .cambridge. org Cambridge University Press 978-0-521-70821-0 - Cambridge Vocabulary for PET with Answers Sue Ireland and Joanna Kosta Excerpt More information PET ... them © Cambridge University Press www .cambridge. org Cambridge University Press 978-0-521-70821-0 - Cambridge Vocabulary for PET with Answers Sue Ireland and Joanna Kosta Excerpt More information...