Which of the following sentences does NOT illustrate correct verb and verb tense usage?

Did you see the show last night?

Did you hear the weather report for tomorrow?

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

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.

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

One thing I know about him ____________ .

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

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

Rochelle felt ___________about forgetting her ___________ friend's birthday.

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