Context clues! Always look at the surrounding words to identify the meaning. By doing so, you can figure out if the author intends to use the denotation or the connotation.
I guess you could join these two sentences like this:
The Liberty Bell has had a crack in it that could not be fixed ever since. Instead of having two separate sentences, you can combine them into one by making sentence 12 into a phrase rather than a sentence. Thus they become one.
Answer:
1A. Where were you when the earthquake happened?
B. I drove to work at the time
2A. What did you do at ten o'clock yesterday morning?
B. I helped my dad plant flowers in the garden
4A. Do you want to come to the cinema tonight?
B. I'm afraid I met Diane
3A. Do you get any plans for this summer?
Here are the answers to the given statements above:
1. The given sentence is an example of a complex sentence. This sentence includes an independent clause and dependent clause.
2. The given sentence is an example of a simple sentence. It only contains one independent clause.
3. This is an example of a fragment sentence, which misses the predicate.
4. This is an example of a simple sentence having a compound predicate. Hope this answer helps.