1. I always have _______ lunch at 12: 00 in the afternoon.
A. a B. an C. the D. /
【解析】选D。have lunch“吃午饭”，固定短语，三餐前不用冠词，故选D。
2. Daming often runs _______ the morning, but _______ Sunday morning he doesn’t.
A. in; in B. in; on C. on; in D. on; on
【解析】选B。泛指某个上午用介词in; 具体到某一天的上午用介词on，故选B。
