Decide whether the underlined word below is a preposition, interjection or conjunction. The last customer left, so we closed the shop.

Conjunction

Explanation:

I cannot see underlined words in the sentence from your question but I can tell that it is about the word ''so'' because this is an example of conjunction that is connected to the beginning of the sentence with ''We closed the shop''.

There is no proposition or interjection in this sentence so those two are incorrect answers.

Conjunction is often used in the sentences to connect and coordinate clauses and sentences so they can be more meaningful. Some other examples of conjunction are: For, And, Nor, Such...that, and more.

the number of people with jobs in factories as unskilled workers increased.

you have to tell us what you're talking about or it's impossible to answer.