The desk_____Tom is leaning is Jack's. It's covered with dictionaries.
against which
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MrsZhangoftentellsusthatspringisthetime____peoplegosightseeing.
Let's go swimming,_______?
Mrs Zhang often tells us that spring is the time ____ people go sight seeing.
The aeroplane ____ she was traveling was delayed for three hours at least.
Someconceptsmaybedifficulttograspchieflybecausetheymaybeunfamiliaror_____ideas,opinionswhichwealreadyhold.