The issue with the underlined sentence is quite simple, with the verb form "knew," a past tense construction, being at odds with "has," a present tense form. These need to work together, making the correct answer choice "the negotiator knew he had to accept."

The sentence as written actually contains no verb, as "stated" is used as an adjective to describe "intention," and the infinitive form "to shock" needs some form of the verb "to be." The only answer choice that remedies the lack of a verb is "The filmaker's stated intention was to shock," and is the correct answer.

"Shown" is a past perfect verb, and any past perfect construction cannot stand alone as the verb in the sentence without a helping verb, also known as an auxilary verb. The past perfect verb "shown" needs to be accompanied by the verb "have" to make it a complete verbal phrase. Therefore, the correct answer choice is "Traditionally, movie audiences have shown favor towards lighter fare."

The use of the present participle verb forms "showing" and "calling" is incorrect in the underlined portion of the sentence. Both words need to be in the past tense to show that the poll was taken before oil prices had begun falling. The only answer choice which appropriately makes these corrections is "showed only a small percentage of experts called for such a drop."

The underlined portion of the sentence is a dependent clause that relies on the rest of the sentence for its meaning. As such, the verb form "bring" does not appropriately connect to the rest of the sentence. "Bringing more tourists, featuring the gerundive is the best answer choice.

The construction of the sentence makes it clear the "litter" is taking place throughout "American history." This means the verb should take the passive voice. "American history is littered" is therefore the correct answer choice.

The sentence describes what happened "at the time," or in the past; therefore, the verb usage must indicate the action taking place in the past, with a past tense verb. "Few people understood" is the correct answer choice.

The correct choice is, "She was going to the grocery store; she was going to buy a few things for the party." The other choices contain examples of tense-shifts that make the sentence awkward. This is the best choice because it the verbs are in the same tense throughout the sentence and the structure of both clauses are parallel to one another.

This sentence contains an error in verb tense. The phrase "ever since she was a kid" indicates that the actions of this sentence describe the past. The current word, "loves," is in the present tense. The correct choice is, "loved."

This sentence contains an error in verb tense. It is clear from the first part of the sentence ("In the future") that the action should happen in the future. The only choice that indicates this is "will rent." The other choices are all past tense or does not have the proper form. The correct choice is, "Lacey will rent a car for her trip."