Complete the sentences with the correct forms of the verb in brackets.Use the Present Perfect of Perfect Continuous.

1. I think I can get a great result in the test in biology I________ (study) all week!

2. How mamy pages of his science essay ___________ (Gregory/complete) so far?

3. Sandra thinks someone ____________ (watch) her with a drone.

4. You look tired. How long______ (you/work) on your Al project?

5. Who _________(eat) the last piece of cake?