1. I am taking some food----- I get hungry.
b. if
2. I will take my jacket off--- it gets hot
a. if
Explanation for 1 and 2:
In case is a phrase that means if something happens or if something is true. Incase is a misspelling of encase, which is a verb that means to enclose something within something else.
In case of is a preposition. It is used before a noun. In these sentences, you have clauses and, therefore, need a conjunction.
3. I don't --- any body to talk to me like that.
b. allow
Explanation:
the verb allow should be used with to-infinitive while the verbs let and make are used with a bare infinitive (the infinitive form of a verb without the word "to")
