stem: dog be pet
choice: human sex
choice: book sleep
choice: heart love
choice: earth world
choice: sleep cat
choice: newspaper library
choice: earth universe
choice: barbecue cook food
choice: agree with someone nod of head
choice: fire hot
choice: wait on line boredom
choice: student study math
choice: basketball fill with air
choice: do some exercise do cool-down
choice: cat sleep
choice: cup plastic
choice: go to zoo see animal
choice: short distance between two point straight line
choice: go to film go to movie theater