b) towards ....
a) towards ....
In the given sentence, the blank can be filled by the word 'towards'.In the given question, if we use the preposition 'for', the phrase 'outlook for the world' does not make any sense.'For' preposition is used when we need to specify some object that belongs or being given to a person.'Towards' is used when when we need to specify some attribute towards a person.So, the sentence finally stands as, 'They increase our knowledge and change our outlook towards the world.'
Explanation:Prepositions are a very important of speech.They usually determine the position of a word with respect to the others or determine the relationship between two or more nouns.Along with verbs prepositions pair up to form prepositional phrases or phrasal verbs.These phrases serve as idiomatic expressions.The given sentence,' Books change our outlook the world.' needs a preposition to relate the link between the expressions 'our outlook' and 'the world'.The main verb is 'change' and the subject is 'books'.The preposition has to link the subject, verb and objects in the sentence.The most appropriate preposition is 'towards'. It specifies a particular direction for the word 'outlook'.The sentence thus becomes : Books change our outlook __towards the world.
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