I don’t like physics ______ it’s too difficult for me.

Tina was hesitation about the job offer as she did not know _______ the company was an established one

John is ________ honest boy. He has ________ useful book.

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

alked a lot about walking, I want to say it is a cheap, safe and enjoyable form of exercise