Present Perfect Simple or Continuous?

___________________ (they / arrive) already?

I ___________________ (clean) all morning – I’m fed up!

He ___________________ (eat) six bars of chocolate today!

The students ___________________ (finish) their exams. They’re very happy.

Lucy ___________________ (run) 2000 metres today.

Julie ___________________ (cook) dinner. Let’s go and eat!

How many times ___________________ (you / take) this exam?

I ___________________ (wait) for three hours already !