Present Perfect or Simple Past?

A classic exercise! What is the right form of the verbs in the following sentences?

When you finish, click to see the answers.

My friends and I .......... to the countryside last Saturday.
have gone
went
The rain .......... so heavy lately that the plants are greener.
has been
was
Once the movie .........., I went to bed.
has finished
finished
Malcolm and Smithers .......... in the fast food business for twenty years now.
have been
were
.......... anybody .......... the keys yet?
Has anybody found
Did anybody find
When I was a child I .......... a dog called Pooch.
have had
had
There .......... a thunderstorm since 2 months.
hasn't been
wasn't

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