Hehasfourson,____(他们全部都是那个偏僻山村里的高级教师)。

Thereason____(为什么这事情会这样)isnowclear.Idon'tneedtoexplainitoncemore.

Ioftenthoughtofmychildhood,____Ilivedonafarm.

Rock:______.

Sharon:Verywell,andtheexperimentisnearlyfinished.

Someconceptsmaybedifficulttograspchieflybecausetheymaybeunfamiliaror_____ideas,opinionswhichwealreadyhold.