Given a sentence with a missing word, pick the answer option that best fills out the missing word in the sentence. Indicate each answer with its index ('a', 'b', 'c', 'd').

Most children improve in three to ____ days.\Question: Choose the right answer from options given a) seven b) six c) four d) ten
a

Real airplanes have round engines and ____ wings.\Question: Choose the right answer from options given a) four b) six c) three d) two
d

Fawns have less than ____ teeth.\Question: Choose the right answer from options given a) zero b) no c) six d) ten

c