从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。
1. —Does the boy usually have breakfast out?
—Yes. But today he got up very early and had good breakfast at home.
A. /; a B. the; an C. /; an D. the; a
2. —When did Li Mei begin to learn English?
—At the age of six, she began teaching English.
A. her B. hers C. herself D. she
3. —I left my keys in the room yesterday. I had to get in the window.
—Oh, it’s dangerous to do that.
A. to B. through C. over D. across