Complete the sentences.Use for or since.
The boys are tired. They have been playning football... an hour and a half. Alex has been talking on the phone... I came home. The telephone has been ringing ... about a minute. Why doesn't someone answer it ? Mr Williams has been writing his book ... half a year abd hasn't finished it yet. People have been working in this ... the beginning of the century. John has been washington hic car ... nine o'clock this morning. Sarah has beet waiting for her sister .. a long time

The boys are tired. They have been playning football..for. an hour and a half. Alex has been talking on the phone..since. I came home. The telephone has been ringing .for.. about a minute. Why doesn't someone answer it ? Mr Williams has been writing his book .for.. half a year abd hasn't finished it yet. People have been working in this .since.. the beginning of the century. John has been washington hic car .since.. nine o'clock this morning. Sarah has beet waiting for her sister .for. a long time