Помогите пожалуйста выбрать правильную форму глагола, стоящего в скобках.

1) I wasn't hungry last night. I (not/eat) anything.
a) did not eat b) was not eating c) had not eaten

2) we (learn) to speak english by the end of last year.
a) learnt b) was learning c) had learnt

3) I was late but my friends (wait) for me when I arrived.
a) waited b) were waiting c) had waiting

4) ...you (watch) TV when I phoned you?
a) did... watch b) were...watching c) had... been watching

5) The concert (begin) two hours ago.
a) degan b) had degun c) was deginning

6) I (wear) the new shoes for only ten minutes when the heel broke.
a) wore b) was wearing c) had been wearing

7) What a beautiful dress! Is it new?-No? I (duy) it last year.
a) bought b)had bought c)had been buying

The postman came while I (have) breakfast
a) had b) had been having c) was having

9) We (prepare) our exercises dy 5 0'clock yesterday.
a) had prepared b) had been preparing c) prepared

10) Victor finished the report he (work) on for two days.
a) was working b) had worked c) had been working