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.Use the appropriate forms of the verbs in brackets to complete the text

. No one (1) (know) knows when the first humans (2) (discover)have hiscovered how (3) (make) to make a fire. It probably (4) (happen) happened by accident. Perhaps someone (5) (rub - тереть) have been rubbing two dry sticks together when he (6) (notice) noticed that they were becoming warm. The harder the person (7) (rub) rubed them, the hotter they (8) (become) become and then flame (9) (appear) appeared “If we (10) (do) will do it like this, we will be able to have fire when we need it,” the prehistoric people (11) (think) thought “We (12) (find) found out the way to make a fire!”

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