Instructions: Write the correct word or phrases in the space before its definition. stubborn ambiguity compulsory cluster trivial exotic cognitive more often than not on sale be saturated with 1._____ n. a small group of people or things that are very close to each other 2._____ a. that must be done because of a rule or a law 3._____ a. very difficult to change or defeat 4. _____ a. related to the process of knowing, understanding, and learning sth 5._____ a . used for describing things that are interesting or exciting because they are in or from distant foreign countries 6._____ a . not very interesting, serious, or valuable 7._____ n . the state of being unclear, confusing, or not certain, or things that produce this effect 8. _____available to be bought at a lower price than usual 9.______ be completely filled with things or people 10._____usually 注意:答案中所有字母均需小写;短语书写时,词与词之间空一格。