某单位急需用车，但又不准备买车，他们打算和一个体车主或一出租车公司签订月租车合同．个体车主答应除去每月1500元外，每千米收1元；出租车公司规定每千米收2元，不收其他费用．设该单位每月行车x千米，就x的不同范围讨论该单位选择哪家更合算．

根据句意，用所给单词的适当形式填空。

小题1:“Help _____________(you) to some fish．” Mrs．Black said to her guests．

小题2:Although he is in his _____________(ninety), he can do some farm work and look after himself well．

小题3:Neil Armstrong took some rock samples for _____________(far) research．

小题4:When the parade of Disney characters appeared, all tourists screamed with _______(excited)．

小题5:Beijing is in the _____________(north) part of our country．