Complete the sentence.

An ecologist is a person .

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1while i was  trying to get m y car started, a passing car stopped  and the driver offered  to help me.  2 the police paid  no attention to jos complaint because she had  phoned  them so many times before.  3 mary was  not wearing  her glasses at the time, so she did  not notice  what kind of car the man was  driving.  4 nick lay  down on the grass for a while, next to some tourists who were  feeding  the ducks.  5 tony admitted  that he had  hit  the other car, but said that he did  not damage  it. 6 sorry, i wasn't listening  to you. i was  thinking  about something else.7 helen felt  very tired, and when she finished her work, she fell  asleep.8 the police got  to tom's house as fast as they could, but the burglars had  disappeared.9 i phoned  you last night but you didn't answer.  what were  you doing?