What are the keywords in the following sentence? selection of food on sale in a supermarket
food, sale, supermarket

What are the keywords in the following sentence? creative handmade stuffed toys for sale at the market
sale, stuff, toy

What are the keywords in the following sentence? black and white shot of renovations being done on a new downtown apartment building .
building, renovation, shot

What are the keywords in the following sentence? a bus stops to pick up some passengers
bus, passenger, pick, stop