Put the verb in the correct form of the Perfect Continuous.
I (to play) the guitar for a long time when you phoned me.I (to sleep) for only 2 hours when the alarm clock rang.We (to sunbathe) on the beach for several hours by the noon. Mary (to play) with her doll when her brother gave her a ball. Mark (to choose) a new telephone for an hour before he decided not to buy it. She said she (to look) for us for an hour. By tonight I (to keep) to a diet for 2 weeks already. When he came, she (to cook) dinner for half an hour.