Put the verbs in the correct form, past progress or simple past.
a. I was waiting (wait) for my friend outside the stadium when he arrived (arrive).
I was in the countryside with my grandparents some weeks ago. One night I (walk) ..............along a coutry road when suddenly I (hear)... footsteps behind me. Somebody( follow) ……………...me. Then I (start).......................to run. Mrs. Smith (invite) …………….Mrs. Quyen to have dinner while Mrs.Quyen (visit)....................the USA. Mrs. Quyen (do) …………….shopping while Mr.Thanh(attend)………... a business meeting. How fast (the girl / ride)…………..when the accident…………………...(happen)? I (go) ..........................to the post office to receive a parcel yesterday. While I (fill out)……………....the form one of my old friends (slap).................... me on my shoulder. I (be)……………...so happy to meet him. Yesterday Tuan (ask)………………...me to go to the station with him, but I (not want) to leave the house because I (wait)…………. ....for a phone call. During the study period in class yesterday, it (be)…………….....hard for us to concentrate because the students next door(make)………………..so much noise.