Hi can someone help me with my English homework?

1.I...the windows all day without any help!Two more and I can have a rest.
I've been washing or I've washed

2.you look nice!Have you...your haircut?
been having or had

3.This time last year I...at university.
studied or was studying

4.Has someone...my special bread? There's only a little bit left
been eating or eaten

5.I've English for three years and soon I'm going to be using it at work.
been learning or learned

6.Sorry,I'm late!how long....?
have you been waiting or have you waited

7.when we saw the crime we...the police
called or were calling

and please explain for me about usage of simple verbs and continues verbs:)
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