I don't have your question, so it's a little hard to answer exact to your question.
If 2 bonding pairs, 0 lone pairs, the shape would be linear (180 degrees) as the bonding pairs want to repel each other as much as possible.
If 3 bonding pairs, 0 lone pairs, the shape is trigonal planar (120 degrees) as the bonding want to repel each other as much as possible.
If 2 bonding pairs, 1 lone pair, the shape is bent (~117.5 degrees). This is because the bonding pairs repel other electron pairs slightly more than a regular bonding pair.
These are probably acceptable answers, not that I've ever seen a 6 mark question on bond angles. If you are able to send me a copy of the exact question you are answering I can give it a go