________they'vegottoknoweachotheralittlebetter,theygetalongjustfine.
heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.
设曲线y=ax^2+2x在点(1,a+2)处的切线与直线y=4x平行，则a=（）
设A，B是两随机事件，则事件AB表示（）
WeweretoldthatSuewouldbeidealforthejob,butshe________badlywhenwetalkedtoher.
