In fact Peter would rather have left for San Francisco than ____ in New York.

Everyonehopesthatwecandosomethingtomakethingsbetter,sowecan'thelp______underthestress.

雄性园丁鸟构筑装饰精美的巢。同一种类的不同园丁鸟群建筑的巢，具有不同的建筑和装饰风格。根据这一事实，研究人员认为园丁鸟的建筑风格是一种后天习得的，而不是先天遗传的特性。以下哪项为真，则最有助于加强研究者的结论?

He doesn't know what to say, for it is the first time that he ______ with a girl.

Weallthinkthat_____noneedtomakelawstopreventtheyoungfromgettingmarriedduringtheircollegelife.