1.They (study)……………………. in the library when the fire alarm went off. 2. It (snow)……………………………. when I got up this morning. 3.Abert Einstein…………………………… ( show) his experiment when I came 4. Tom ( watch) ……………………TV while I (read)…………… books yesterday. 5. Hellen (wait) ……………………………for me at 7 pm yesterday 6. ……..he (work) …………………………..his way through college at this time? 7.He (teach)………………….. economics at Harvard when his dad arrived to live with him 8. The wind (blow)……………………….. very hard when I went out this morning. 9. He fell off while he (go)……………………… down the stairs. 10 . At this time last month, I (visit) ………………London

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