Which of the following sentences is grammatically correct?

Which word in the following sentence is a preposition?

The first hour of her shift was exhausting.
 

Which word is an adverb in the following sentence?

She runs often to keep her heart healthy and strong.
 

What is the independent clause of the following sentence?

Despite the danger of the icy roads, Melanie arrived on time.
 

Which of the following sentences is grammatically correct?

Which word in the following sentence is the indirect object?

I threw the ball across the park to my dog.
 

What is the direct object of the following sentence?

When requested, the assistant handed the surgeon the scalpel.
 

Select the abbreviation that best completes the following sentence.

Those a part of Generation X ( ___, those born between 1965 and 1980) are particularly concerned about cardiovascular disease.
 

Which of the following sentences contains a predicate adjective?

Select the word not used correctly in the following sentence.

Vivian could always be found between the plants of her flourishing garden.