Complete the sentences.use for,since,all day 1)the boys are tried.they have been playing hour and a half. 2) alex has been talking on the phone 5 o'clock 3)the telephone has been 4)mr williams has been writing his half a year and he hasn't finished it yet 5)people have been working on this beginning of the century 6) john has been washing his o'clock this moning 7)sarah has been writing her 8)we have learning the hour and a half