Asisknowntousall,theage_____childrencangotoschoolisseven.
at which
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Someconceptsmaybedifficulttograspchieflybecausetheymaybeunfamiliaror_____ideas,opinionswhichwealreadyhold.
"Doesn'tElaninewanttoseethatmovie?""Yes,butshesays_______gotonight."
Lastnighthesawtwodark_____enterthebuilding,andthentherewastheexplosion.
Istillrememberthedays____westudiedtogether.
.Look,theyareclimbingupamountain,____(在它顶上屹立着一座古老庙宇)。