Урок 44. For/sinceComplete the sentences.Use for or since.1) The boys are

Урок 44. For/sinceComplete the sentences.Use for or since.1) The boys are tired. They have been playing football ... an hour and a half.2) Alex has been talking on the phone ... I came home.3) The telephone has been ringing ... about a minute. Why doesn39;t someone answer it?4) Mr Williams has been writing his book ... half a year and hasn39;t finished it yet.5) People have been working on this ... the beginning of the century.6) John has been washing his car ... nine o39;clock this morning.7) Sarah has been waiting for her sister ... a long time.