Fill in the blanks: present perfect or simple past?

They _____ (go) to the USA two years ago, but now they ____ (come back) to England.

There ____ (be) an earthquake in my country several years ago.

They _____ (sell) their house at the seaside last year, but now they _____ (buy) one in the countryside.

I'm sure I ____ (be) here before.

She _____ (not forgive) me yet for forgetting her birthday.

A: I ____ (forget) to call Robert yesterday. B: I know. He _____ (already call) you three times this morning.

A: Is it still snowing? B: No, it ____ (stop) five minutes ago.

A: _____ (Sam and Ann / meet / ever) before? B: Yes, They ____ (meet) while Sam was in India.

Who _____ (invent) the electric light bulb?

Jim ____ (go) to the shops an hour ago and he ____ (not come back) yet.