She looks very tired because she ______ for her exams all night.
A) has studiedHow long ______ English at this language school?
A) have you been learningI'm covered in paint because I ______ the living room since morning.
A) have paintedThey ______ to fix the computer for over three hours, but they still haven't found the problem.
A) have triedThomas is out of breath because he ______.
A) has been runningSarah's eyes are red. She ______.
A) has criedHow long ______ waiting for the bus?
A) have you beenThe children are very quiet. They ______ video games for two hours.
A) have playedMy brother ______ for a job since he graduated from university.
A) has lookedWhy are your clothes so dirty? What ______?
A) have you done