Thế nào là bón lót,thế nào là bón thúc

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C/ PRECTISE: I. Put the verbs into correct form: past progressive or past simple. 1. The doorbell ........................ (ring) while Tom ....................... (watch) television. 2. How fast .................. you ......................... (drive) when the accident ............... (happen) ? 3. Anna and Susan ............... (make) dinner when Martin ....................... (arrive) home. 4. The light ..................... (go) out while we ................. (have) dinner. But it .............. (come) on again after about ten minutes. 5. "What ..................... you ........... (do) this time yesterday?" - I ........... (work) on the computer." 6. It suddenly ............ (begin) to rain while Laura ............ (sit) in the garden. 7. It .............. (be) cold when we ............... (leave) the house that day, and a light snow ......... (fall). 8. When I last .......... (see) them, they ............... (try) to find a new house near their work. 9. I .................. (walk) along the street when I suddenly ........... (feel) some thing hit me in the back. I ............... (not/ know) what is was. 10. When we ............. (deive) down the hill, a strange object ............. (appear) in the sky. II. Write sentences whit the cue words, using the past progressive tense. Ex: I/ weite/ my report/ 8 o'clock last night -> I was writing my report at 8 o'clock last night 1. They/ play tennis/ 10.30 yesterday morning. => .............................................................................................. 2. Ann/ do/ homework/ 5 o'clock this afternoon. => ............................................................................................ 3. My father/ wash/ car/ from five to six. => ......................................................................................................... 4. This time las year/ we/ live/ France. => .............................................................................................................. 5. The students/ offer/ flowers/ the visitors. => .................................................................................................... 6. I/ cook/ dinner/ half an hour ago. => ................................................................................................................. 7. She/ work/ the studio/ that time. => .................................................................................................................. 8. What/ you/ do/ from 3 to 6 yesterday afternoon?. => ..................................................................................... III/ Choose the best answer 1. Alice " saw/ was seeing " the accident when she was catching the bus. 2 What " were you doing/ did you do " when I called ? 3. I " didn't visit / weren't visiting " my friends last summer holiday. 4. It " rained/ was raining " heavily last July. 5. While people were talking to each other, he " read/ was reading " his book. 6. My sister " was eating/ ate " hamburgers every weekend las month. 7. While we " were running/ ean " in the park, Mary fell over. 8. " Did you find/ Were you finding " your keys yesterday? 9. Who " was she dancing/ did she dence " with at the party last night? 10. They " were watching/ watched " football on TV at 7.pm. yesterday.