My sister trained to be a teacher, but than she decided to become a tour____(GUIDANCE)

My sister trained to be a teacher, but than she decided to become a tour____(GUIDANCE)
My grandfather is 80 years old, and he is ____ in both French and English. (FLUENCY)
My English is a bit______. I haven’t used it for a long time (RUST)
Someone who is going past a particular place is a _____-by. (PASS)