Underline the correct item. 1) by the time graham arrived at the train station, the train has already been leaving/had already left. 2) how long had you been trying/had you tried to call tom before he finally answered the phone. 3) the children had been putting away/had put away their toys before their mum came back home. 4) alan had a headache because he had played/had been playing computer games all afternoon. 5) simon had saved/had been saving money for many years before he bought his own house. 6) the football game had just been starting/had just started when it began to rain.