A：冰棒周围的“白气”，是冰升华形成的水蒸气
B：把5℃的水放入0℃的房间，水将会结冰
C：冬天户外的水管容易冻裂，是由于水结成冰后体积变大的缘故
D：给冰加热，冰的温度一定升高
—Why are you standing here, Tom?—I can't see the blackboard clearly. Two tall boys are sitting ____ me.
（2015•淄博）下列计算正确的是（ ）
已知两数的差与这两数的商都等于9，那么，这两个数的和是____ ．
I __________ a gift yesterday, but I didn't ________ it.
