correct any errors. Please check my answers.

Question

Question: 12) Every player on the team, must give their best effort in the championship game.
Every player on the team, must give his or her best effort in the championship game.

Question: 13) Each person in the seminar must submit a sample of their work in the portfolio.
Each person in the seminar must submit a sample of his or her work in the portfolio.

Question: 14) Every girl at the tryout thinks they are not going to make the team.
Every girl at the tryouts thinks she is not going to make the team.

Question: 15) I’ve heard it said that you can get an abortion in almost any big city these days.
I've heard that one can get an abortion in almost any big city these days.

Question: 16) I took my dogs’ from their cages and gave them a thorough cleaning.
I took my dog from his cage and gave him a thorough cleaning.

Question: 17) I hope everybody will give this their best efforts.
I hope everyone will give his or her best effort.

Question: 18) College athletics are becoming more popular each year.
College athletics are becoming popular each year.

Question: 19) The dog or the cat are hiding under the porch.
The dog or the cat is hiding under the porch.

Question: 20) Transportation in this country, cars, boats, and trains, are becoming too expensive.
Transportation in this country, cars boats and trains is to expensive.

Answer 1

12. OK if you delete that comma.

13, 14, 15, 17, 19 = OK

16. How could you write this correctly and keep it in the plural?

18. The original reads better than the revision.

20. How will you correct this? http://grammar.ccc.commnet.edu/grammar/marks/dash.htm

Answer 2

how student can attain optional as given a chance as creatively, critically, productivity and meaningfully