Tom needs some help ________ his homework. Can you help ________?
A：to, he
B：with, him
C：to, his
D：with, his
糕点疏松的主要成分中含有碳酸氢钠，某化学兴趣小组对碳酸氢钠的化学性质进行探究．
以下说法中正确的是（ ）
在冬季，人们在冰面凿冰捕鱼利用的原理是在冰孔处（ ）
