By Rae Wee SINGAPORE (Reuters) – The Australian and New Zealand dollars gained ground on Monday ahead of expected rate hikes from their respective central banks later in the week, while the dollar slipped against a basket of currencies. The Aussie was up 0.19% to $0.64230, away from a 2-1/2-year low of $0.63635 hit last week, while the kiwi was 0.44% higher at $0.56280, similarly pushing away from last week’s trough of $0.55645. The Reserve Bank of Australia and the Reserve Bank of New Zealand meet on Tuesday and Wednesday, respectively, with markets expecting both to lift their cash rate by 5…