Choose the correct dependent preposition.

1) People should be careful ... what they say and do.
a) at b) with c) on d) about

2) What are you so happy ... ?
a) at b) with c) on d) about

3) Sandy’s really keen ... shopping.
a) at b) with c) on d) about

4) I’m sorry to say, but I’m bad ... learning new words.
a) at b) with c) on d) about