Put the verbs in brackets into the past simple, past perfect or the past perfect continuous. 1) kate (go) out with her friends after she had finished her homework 2)dr stephens (perform) a lot of experiments before he made an important discovery 3)how long (you\wain) before the bus arrived? 4)when (james\graduate) from the university? 5) sam (not\win) oung inventor of the year award last year, but he's sure he will this year

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