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Lesson  20



                 Exercise



                   Fill each blank with the proper word to complete the sentence.







                                    primary              collapse                 install


                                           threathens                    all









                   1.   What is your ___________ reason of staying here?


                   2.   That building will ___________ anytime from now.


                   3.   I will ___________ these programs first.


                   4.   Every time they fight, Janna ___________ to leave.


                   5.   Have you watched this documentary ___________ TV.















































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