What is the best way to revise the sentences for fluency and word choice? some scientists are for a manned mission to mars, while others are against a manned mission to mars. people should think about it. since scientists have stated both pros and cons for a manned mission to mars, there are a number of factors for people to consider. there are pros for a manned mission to mars. there are cons for a manned mission to mars. there is a lot for people to think about a manned mission to mars. when it comes to a manned mission to mars, people should take some time to think about it because some scientists feel there are pros, while other scientists feel there are cons.