He admitted that when ______ comes to repairing a computer, he had little knowledge of it.
A:he
B:that
C:this
D:it
我听到了鸟叫声。可以说:
香港位于珠江口的____侧,澳门位于珠江口的____侧。
小明家买了30个苹果,3天吃了12个,还剩多少个?正确的列式是( )