Present Perfect vs Simple Past

I (buy) a new laptop yesterday.

I (go) to Australia three months ago.

We (walk) around our neighborhood last weekend.

I have (write) my report.

Two weeks ago, we (sell) our house.

My doctor still (give,not) me the results.

She (drive, not) to work last Monday.

He (have) never studied another language.

Did you (do) your homework last night?

They (feed, not) their dogs yet.