1. Tom (cook)......... the dinner when I came 
2, What ......he (do).........when you came?
3. All the students  ( read)........the text carefully
4. They (walk)..........to the coner
5. They (study).........in the library when the fire alarm went off
6. It ( snow).............hen I got up this morning.
7. Halen (wait)............in the lobby, wasn't she?
8. The wind (blow).............very hard when I went out this morning
9. He fell while he (go)........down the stairs
10. When......... she (be) at 5 o'clock this morning? 
Cứu e vs. Mai e đi học rồi ạ