Question

grammar
education is freedom!
the bodies of the string instruments, which are hollow inside to allow sound to vibrate within them, are made of different kinds of wood, but the part of the instrument that makes the sound is the strings, which are made of nylon, steel, or sometimes gut. the strings are played most often by drawing a bow across them. the handle of the bow is made of wood and the strings of the bow are actually horsehair from
(a) horses tails
(b) horses tails
(c) horses tails
(d) horses tails
probably the ______ busiest conductor, valery gergiev has held several formal conductor positions, including with the london symphony orchestra, munich philharmonic, marinsky theatre, kirov opera, rotterdam philharmonic orchestra, and armenian philharmonic orchestra.
(a) worlds
(b) worlds
(c) worlds
(d) worldss
stretch: there are a few different ways to sharpen a knife, including pull-through manual or electric sharpeners, spinning grindstones, and whetstones. some specialty knife retailers have professional sharpeners who use whetstones to sharpen the ______.
(a) knifes blades
(b) knives blades
(c) knives blades
(d) knives blades

Explanation:

For question 5:

• The possessive form for plural nouns (horses) is formed by adding an apostrophe after the's' (horses'). And 'tails' is the plural of 'tail'. So 'horses' tails' is correct.

For question 6:

• The possessive form for a singular noun (world) is 'world's' to show something belongs to the world.

For the knife - related part (assuming it's a similar possessive form question):

• The plural of 'knife' is 'knives' and the possessive form for plural 'knives' is 'knives' (apostrophe after the's'). And 'blades' is the plural of 'blade'. So 'knives' blades' is correct.

Answer:

1. B. horses' tails
2. B. world's

(Assuming the knife - related answer is based on the same possessive rules as above, if it's a possessive form question for 'knives' and 'blades') B. knives' blades