Why are scientists targeting a specific type of mosquito?

What is a casting director, and what do you think might be some of the possible benefits of a director using a casting director? what do you think might be some of the possible drawbacks of a director using a casting director? your response should be at least five sentences. use complete sentences and offer evidence to back up your opinion.

Composition about "the day i ran away" with 500 words

Which sentence is punctuated correctly? the shoes normally cost 40 dollars, however; we got them on sale. the shoes normally cost 40 dollars however we got them on sale. the shoes normally cost 40 dollars, however, we got them on sale. the shoes normally cost 40 dollars; however, we got them on sale.