单项选择题
When Lily came home at 5p.m. yesterday, her mother（） dinner in the kitchen.
A.cooked B.was cooking C.cooks D.had cooked
单项选择题 He helps me（）my homework.
单项选择题 She was happy,（）
单项选择题 I don't know the park, but it's（）to be quite beautiful.
