Which of the following sentences illustrates the proper use of parallel construction?

My mother is often angry ________ me. I don't know why she's always upset. It depends ________ her mood, I guess.

His boss told him to finish the report _______ 5 pm. After that, he could go _______ vacation.

Rochelle felt ___________about forgetting her ___________ friend's birthday.

Which of the following sentences illustrates correct usage of articles and conjunctions? You have to be on time; otherwise, you'll miss the train.

The residents believe that the development in their city isn't __________ keeping __________ the rest of the country.

I placed my notes _______ my desk and referred to them _______ the meeting.

It's never too late to learn how to swim ________________ you may fall off a boat!

Although Marvin said he had hidden the keys _______ the flower pot, we were unable to find them _______ the dark. In the end, we waited for him at the coffee shop ___________ the corner.

Only after they had completed an exhaustive study __________ how to adapt the technology to the needs of our company.

Did you hear the weather report for tomorrow?