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52 A research B experiment C analysis D service

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5 The reason for their unusual behavior. remains a puzzle.
A fact B mystery C statement D game

27 Sometimes you may find it very difficult to decide .
28 Before you lend money to your friend, .
29 If the loan is past due, .
30 If your friend refuses to return the money, .
A you can remind your friend of it via e-mail
B you can lend more money to him or her
C you must get to know why he or she needs that money
D if you should lend money to your friend
E you can call the police to settle the issue
F there is no need to maintain a friendly relation with him or her

A.inherited B.sent C.handed D.given

6 Jack is a diligent student.
A hardworking B ambitious
C lazy D slow