Ex. 1 Put the verbs in brackets into the Present Perfect Simple or Present Perfect Continuous (раскрой скобки употребив глагол в Present Perfect Simple или Present Perfect Continuous)

Don't walk here. I…........(just/clean) the floor.
Jane is hungry. She …............(not /eat) anything for six hours.
She is tired. She …......(study) for four hours.
I don't want to see that film again. I ….......................(see) it twice already.
Sandy …...................(teach) English for 10 years.
Chris …..................(not/do) the washing up yet.
He …......................(walk) all the morning.
They.......................................(play) in the garden for two hours.