I don’t like the colour of the T-shirt. Would you please show me _______ one

Gun control is a subject Americans have argued for a long time.

______ two exams to worry about, I have to work really hard this weekend. [ ]

You ______ pay too little attention to your reading skills, as they are so important.

This meeting room is a non-smoking area. I would like to warn you___________ that if you smoked here you would be fined.