Present Perfect vs Past Simple

We [blank_start]have lived[blank_end] (live) in this city since 2006.

My son [blank_start]went[blank_end] (go) to the doctor's last week.

I [blank_start]have studied[blank_end] (study) English for two hours.

They [blank_start]have[blank_end] already [blank_start]understood[blank_end] (understand) the use of the Present Perfect.

We [blank_start]bought[blank_end] (buy) a CD player a long time ago.

She [blank_start]hasn't[blank_end] [blank_start]finished[blank_end] (not finish) her homework yet.

We [blank_start]saw[blank_end] (see) a fantastic play in September.

[blank_start]Have[blank_end] you ever [blank_start]sold[blank_end] (sell) a magazine?

Yesterday, I [blank_start]didn't[blank_end] [blank_start]forget[blank_end] (not forget) what I had to do.

[blank_start]Did[blank_end] you [blank_start]drive[blank_end] (drive) your car on Wednesday?

I [blank_start]have[blank_end] never [blank_start]tried[blank_end] (try) to cut my hair.

We [blank_start]haven't been[blank_end] (not be) to Mexico before.