Fill in the blanks with the appropriate word:
It’s going to start raining. Let’s go home before that.
Let’s go home ____ it starts raining.
A. After
B. When
C. Before
D. While

Hint: To find out the answer for this sentence one must know about subordinating conjunctions which can be used to connect an action or an event to a point in time.

Complete answer:
Conjunctions or linking words are used to join two words, phrases or sentences. For example: My friend is intelligent but her handwriting is poor. Here, but is a conjunction which is used to join two opposite sentences, i.e. one positive and one negative sentence.

>Option A: After means next in time and it is used when one action happens next to another. So, this cannot be the answer and thus this is an incorrect option.
>Option B: When is used to talk about a specific point in time when something happened or will happen. This cannot be used in the sentence. Thus, this is the wrong option.
>Option C: Before is opposite of after where one action happens soon after the first one. This is the correct answer because in this sentence it states that rain is about to come and we have to reach home before it starts raining. This is the correct answer.
>Option D: While is used to show those actions or events which happen at the same time in the past, present or future. This cannot be used in the sentence. Thus, this is the wrong option.

Hence the correct answer is option ‘C’ i.e “Let’s go home before it starts raining.”

Note:Subordinating conjunction is a conjunction that links dependent clauses to an independent clause. Function of subordinating conjunctions is to show a relationship between two clauses involving a transition of time or place. The first statement has before and the second statement supplies the same meaning. So in order to complete the sentence the option before should be chosen so as to make the sentence grammatically correct.