Complete the sentences with the present perfect continuous.

1. You look tired.... (you/work) in the garden all afternoon?

2. We ... (use) solar power for ten years now.

3.The children .... (play) on the computer for a long time. Tell them to stop.

4.A lot of animals .... (lose) their natural habitats recently.

1.have you worked

2.have used

3.have played

4.have lost