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Q. 7,option C; Q. 8, option, b; Q.9, option b; Q. 10,option d; Q.11,option A

Explanation:

Q.7; the option C has a personal bias and would not form an effective reference tool which suppose to leverage on facts not opinions.

Q.8; Cited words usually would have a referenced page at the end. Noting this cited works are best referenced using first words [ in parenthesis] from the particular source listed on referenced page.

Q.9, Copying someone else's work without reference is a grave offence called plagiarism; so cited works has to be referenced.

Q.10; Research are usually narrowed to a particular aspect inorder to be effective because focusing on all aspects doesn't bring the vitality of the research to bear.

Q.11; The northern light is the focus not Alaska and we can see how the statements tailors people from different settings hence option A is the best option.

sentence lenght varies according to word choice.you select which word to use and that will require to use other expressions that collocate with the word chosen.sentence length will vary   according to the choice of words you make to express your ideas.  

i think its d

hope that is