Present Perfect and Past Simple

Choose the right variant. David ... the eco-helpers club last year.

Choose the right variant. Sarah ... the rubbish yesterday.

Choose the right variant. Recycling household rubbish ... certain benefits.

Choose the right variant. I ... never ... to Africa.

Choose the right variant. Pollution ... a lot of problems recently.

Choose the right variant. ... you ... a hammer to build a nesting box yesterday?

Choose the right variant. We … a new car.

Choose the right variant. Acid rain ... the fish and plant species in this area two years ago.

Choose the right variant. He made a donation to the WWF, ... he?

Choose the right variant. We have ... cleaned out the pond.