1．The number of air crashes that ________in developing countries ________increasing.
A．happens；is B．happen；is
C．happens；are D．happen；are
答案 B [air crashes后定语从句的谓语动词用复数；“the number of ＋复数名词”作主语时，谓语动词用单数。]
2．Eric even didn't have ________common sense to dial the number 119 when ________fire broke out.
A．a；the B．a；/
C．/；the D．the；a
答案 D [第一空特指“紧急情况下拨火警电话”这一常识；第二空泛指“一场火灾”。 ]
