设f(0)=0,则f(x)在x=0处可导の充要条件为（）
I'm______tograduateinthenexthalfoftheyear.
WeweretoldthatSuewouldbeidealforthejob,butshe________badlywhenwetalkedtoher.
Ababymightshowfearofanunfamiliaradult,_______heislikelytosmileandreachouttoanotherinfant.
You________gonow.It’sgettinglate.
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