Answer:
1. I was late for work.
- <em><u>a. Simple.</u></em>
2. He failed the test because he did not study hard enough.
- <em><u>c. Complex.</u></em>
3. Even though pollution is widespread, people are doing little to prevent it.
- <u><em>c. Complex.</em></u>
4. Animals should not be killed for their fur, but this is still occurring, so action must be taken.
- <u><em>b. Compound.</em></u>
5. I came to study in the UK because I wanted to improve my English, so I talk to as many English people as possible.
- <u><em>d. Compound-complex.</em></u>
Explanation:
A simple sentence is one that simply states a sentence with a single clause, a subject, and a verb.
Compound sentences have two or more clauses joined together by the conjunctions "for, and, nor, but, or, yet, so" (FANBOYS).
Complex sentences are almost similar to compound sentences except that they are joined not with the FANBOYS but subordinate conjunctions.
Compound-complex sentences are those sentences that are similar to complex sentences but added with another simple or compound sentence added to the sentence.
In the given sentences, sentence 1 is a simple sentence for it simply states a statement.
Sentence 2 and 3 are complex sentences as they are joined by the subordinating conjunctions "because" and "even though".
Sentence 4 is a compound sentence as it is joined by the coordinating conjunctions "but" and "so".
Sentence 5 is a compound-complex sentence as it has both subordinating conjunction "because" and coordinating conjunction "so".