问题补充：
---Look! There are so many people in the park.
---- Nobody likes to stay at home Sunday morning.
A. in
B. on
C. at
D. to
答案：
A. in
(答案→)B. on
C. at
D. to
解析：在表示时间时，in表示在一个时间范围；on表示在具体某一天；at在具体时刻；to表示差几分到。句意：看，公园里有如此多的人。——在星期天早晨没有人喜欢呆在家里面。结合语境可知选B。
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