Вопрос по английскому языку:

СРОЧНО ПОМОГИТЕ ПЛИЗ!!!!С ПРОШЕДШЕМ ВРЕМЕНЕМ!!!!Past simple,past continuous,past perfect or past perfect continuous ?
1)I couldn't get in because I (lose) my keys.
2)after harry (make) himself a sandwich, he (pour)some tea and (let)it to school.
3)They (eat)all the chocolate cake by the time Michael got to the party.
4)when i (walk)though Oxford,I (think)about the good times I (spend) there as a student.
5)As soon as be (finish)mowing the lawn , he (start)cutting the bushes.
6)She asked me if i (be) away on holiday.
7)We (sleep)this night when the neighbours (come)home from the country.
8)He (drive)less than an hour when he ran out of petrol.
9)After I (write)the letter,I (see)it was too late to post it.
10)They (cycle)all day so their legs were sore in the evening.
11)While mother (have)lunch, we (tell)her our impressions from the excursion.