What are the keywords in the following sentence? a librarian arranged some books on the shelf using the decimal system .
book, librarian, shelf

What are the keywords in the following sentence? A dish made of cauliflower and broccoli covered in sauce.
broccoli, cauliflower, dish

What are the keywords in the following sentence? rhododendrons and azaleas blooming in spring
azalea, rhododendron, spring

What are the keywords in the following sentence? a hiker ascends the slopes
ascend, hiker, slope