Matching Pairs 24/7 Listening Vocabulary MatchOnline version Test your knowledge of key concepts related to 24/7 listening and communication. by ngô nhi 1 immediately (adv) 2 ancestor (n) 3 compulsory (adj) 4 extinct (adj) 5 professor (n) 6 ecology (n) 7 palaeontology (n) a university teacher of the highest rank no longer in existence the study of the relation of plants and living creatures to each other and to their environment that must be done because of a law or a rule a person in your family who lived a long time ago without delay the study of fossils as a way of getting information about the history of life on Earth