I. Complete the sentences with the correct tenses: past simple, past progressive, present perfect: 1. When the teacher came in class, all the students (stand) _______________________ up. 2. When we (see) _______________ them last night, they (sing) ___________________. 3. This is the first time she (fly) ____________________ to Tokyo. 4. When she (be) _________ a child, she always (want) _________ to do the most dangerous things. 5. My grandmother often (sing) __________________ when she was young. 6. Up to the present, she (leave) ___________________ Hai Phong for Ha Noi Capital. 7. The workers (complain) __________________ about the matter to me many times. 8. Since you (leave) _______________ last month, everything (change) _______________. 9. Dorothy (write) ______________ her first novel when she (be) _________ 20 years old. 10. While the guests (dance) _________________, thieves (break) _________________ into the house and (steal) _________________ a lot of fur coats last night. 11. She (leave) _________ home two weeks ago and we (not hear) ___________ from her since then. 12. At 4 p. m yesterday? – Well, I (work) _________________ in my office at that time. 13. When I (arrive) _________ at his house yesterday afternoon, he (still sleep) _________. 14. David is repairing the TV set at the moment. He (work) ______________ at it for one hour or so. 15. (you/ wear) ___________________ that dress when your boyfriend (see) ____________ you in the street yesterday morning?