4．(2017·全国卷Ⅲ)I have grown not only physically, and also mentally in the past few years.________________

　　解析： and→but　not only ...but also ...是固定短语，意为"不但......而且......"，连接并列成分。

　　5．(2016·全国卷Ⅰ)Every day he makes sure that fresh vegetables or high quality oil are used for cooking.________________

　　解析：or→and　根据语境可知，新鲜的蔬菜与高品质的油二者之间为并列关系而非选择关系。

　　6．(2016·全国卷Ⅱ)We can choose between staying at home and taking a trip.If we stay at home, it is comfortable but there is no need to spend money.________________

　　解析：but→and　第二句句意：我们如果待在家里，会感觉舒适，还不花钱。根据句意可知，"comfortable"与"no need to spend money"之间是并列关系，而不是转折关系。

　　[谨记规则]

　　并列句由两个或两个以上并列而又独立的简单句构成。在并列句中，这些简单句常由并列连词(短语)连在一起。

并列连词 用法 例句 and, not only ... but (also) ..., both ... and ... 等 表并列、顺承或递进关系 There the air is clean and the mountains are green.

那里空气清新，千山一碧。 but, yet,

whereas等 表转折关系 The failure was a big blow to him, but he wasn't discouraged and soon got as enthusiastic as ever.这次失败对他是个很大的打击，但他并没有沮丧，很快便像以前一样充满热情。 or, either ... or ..., not ... but ...等 表选择关系 Either you must improve your work or I shall dismiss you.要么你改进工作，要么我就辞退你。 for, so 表因果关系。for连接的分句一般不能放在句首 The leaves of the trees are falling, for it's already autumn.树叶在坠落，因为秋天已经到了。