海南三亚西沙群岛:I haven't decided which train I should take.(用动词不定式改写句子)

I can't decide to buy which one, I haven't bought any new___for years. We have two rooms______,but I can't decide ____ I don't want to go and ________I haven't been invited I haven't decided which train I should take.(用动词不定式改写句子) 我没有去过某地,用英语说是I haven't gone to some place还是I haven't been to some place. i still haven`t found what i am looking for I haven't received the specification of this rayon yarn I haven't the slightest idea.我一点儿都不知道。 9.I haven't got a chair ___. Will you make room for me?