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According to the grammar rules for verb tenses. Choose the best alternative to fill the blanks:
1- The police ______________________ (arrest) the suspects last night.
2- They ___________________________ (not/steal) anyone for a month.
3- Scientists ________________________ (test) new medicine last year.
4- I ____________________________ (Not/find) my keys since you left.
5- They _________________________ (work) a lot last night