单项选择
I enjoy having _____ breakfast with my family at home. It makes me feel relaxed.
本题考查 have breakfast 的用法。该短语意为“吃早饭”，breakfast 前不必加任何冠词。
It's necessary for us _____ English well.
我们可用“固定句式法”解答本题。It's＋adj.＋for sb. to do sth.意为“对于某人来说，做某事是……的”，为固定向式，故选选项A。句意：对于我们来说，学好英语是有必要的。
— Did you get up late this morning?
— Yes,so after _____ quick breakfast,I had to run to office.
本题考查冠词。当 breakfast 前有形容词修饰时，形容词前要加不定冠词，由此可知答案为选项C。