【正确答案】 1、we were starting our holidays/we were about to take a holiday    

【答案解析】全句译为汉语：我们正准备去度假，汽车就出了毛病。
考点分析：此句的考点是过去正在进行时。“准备”和“度假”都有好几种表达方式： be prepared to，be going to，to be about to；start one's holiday，spend one's holiday，make holiday， take a holiday…