This sentence contains no errors. The words "big" and "heavy are coordinate adjectives: adjectives that modify the same noun separately, but are not separated with a conjunction. Coordinate adjectives need to be separated with a comma. The correct answer choice is, "The big, heavy machine was necessary in order to complete."

This sentence contains no errors. The phrase "While looking through her scrapbook" is an example of an introductory phrase, explaining information necessary to the context of the sentence, but outside of the main sentence, grammatically. These types of phrases must be followed by a comma in order to separate them from the rest of the sentence. No other changes are necessary.The correct answer choice is, "through her scrapbook, she remembered many pleasant events from her life."

This sentence contains no errors. The word "dreamt" is a valid form of the word "dream." It is the simple past tense form of the word. No changes are necessary; the other choices only add unnecessary words. The correct choice is, "He dreamt of starting his own publishing."

This sentence contains no errors. The word "among" means in the presence of, specifically when whatever mentioned is not a group of things in general. "Between" is used when you have separate and individual things (e.g. between the two rocks). Note that "about" is not a synonym for "among." It means concerning/near. The correct choice is "among."

This sentence contains no errors. Note that the words "in" and "near" are prepositions and start prepositional phrases: such phrases are not separated from the main clause with commas. No changes are necessary. The correct choice is, "weekends fishing in the river near her house."

This sentence contains no errors. The words "every day" means literally, every single day. As one word, "everyday" means commonplace. It is clear from the context of the sentence, however, that this particular factory needs a daily delivery. The other choices all have something to do with days or frequency, but do not quite hit the mark. "Every day" is the correct choice.

This sentence contains no errors. "Its," without an apostrophe, is the proper possessive form of the word "it." With the apostrophe (it's), it is a contraction for "it is." The correct choice is, "its amazing abilities surprised them."

This sentence contains no errors. All of the available choices are synonyms for "carry," but the difference lies in the point of reference. "Carry," "lift," and "truck" are generic words for carrying something, but "bring" indicates that you are carrying something to the position where the subject is, and "take" indicates you are moving away from the subject. The words "when coming to the music lesson" indicate that they are moving towards the direction of the subject: the music teacher (presumably, the teacher is already there). The correct choice is, "bring."

This sentence contains no errors. The phrase "Though he searched for days" is an example of an introductory phrase, explaining information necessary to the context of the sentence, but outside of the main sentence, grammatically. These types of phrases must be followed by a comma in order to separate them from the rest of the sentence. No other changes are necessary. The correct choice is, "Though he searched for days, he was unable to find."

This sentence contains no errors. The word "between" indicates in the space separating specific points. In this case, those specific points are the two cities. No change is necessary. The correct choice is, "between."