Помогите пж1.Mary is very smart but she never chows____a) off b)

Помогите пж
1.Mary is very smart but she never chows____
a) off b) on c) of d) -
2.Are you jealous____ my success?
a) of b) to c) with d) at
3.They arrived_______ the railway station on time.
a) - b) in c)to d)at