1/ When I (arrive)…………… at his house, he still (sleep) ………….. 2/ The light (go)…………. out while we (have)……………. dinner. 3/ The last time I (see) ……….him, he (wear) ………a grey suit. 4/ Just as I (leave)…….. , a student (stop)…………. me in the hall 5/ Nam (play)………… football when he (break)……… his leg. 6/ We (drink) a………. lot of beer at the party the day before yesterday. 7/ They (build)………. a new bridge when I was there 2 months ago. 8/ He (sit)……….. in a cafe when I saw him. 9/ My company (make)………….. a lot of profits 5 years ago. 10/ What you (do) ……….when I phoned you on Monday ? 11/ While the two thieves (argue)…………., someone (steal)……….. their car. 12/ When he was a boy at school, Edison (ask)….. a lot of questions. The teacher (think)…… he was stupid and she (send) him home. Edison's mother (teach) her son at home and he (begin) to carry out a lot of experiments. 13/ - You (visit)………. the zoo yesterday ? - Yes, I did. When I (go)……………… there, I (see)…………… our teacher. 14/ Who (invent)…………………. the radio ? Chia động từ trong ngoặc