What are the keywords in the following sentence? observing place with coin operated telescope is on the hill of town .
operate, telescope, town

What are the keywords in the following sentence? protesters clash with police on a street in central business district on saturday .
clash, police, saturday, street

What are the keywords in the following sentence? browsing the channels on venture funded company using invention
company, fund, invention

What are the keywords in the following sentence? tourists and shoppers walk along a city in city centre
centre, city, tourist, walk