— Do you know if we will go for a picnic this Saturday?
— I think we will if we ________ any classes.
A：won't have
B：didn't have
C：don't have
D：aren't having
—Why do you look so tired?—Because we ________ for three hours without stopping.
读课文《快乐的节日》回答
（小鸟）“羽毛丰满”是什么意思？
