____I stay at home , I ____ be sorry.
下列属于先天性行为的是( )
①蚂蚁作巢 ②蜜蜂采蜜 ③家蚕吐丝 ④大山雀偷饮牛奶 ⑤鸟类迁徙 ⑥鹦鹉学舌.
I usually get ____ (dress) at half past six in the morning.
—It is 7657457.
如图,AB+AC=7,D是AB上一点,若点D在 BC的垂直平分线上,则△ACD的周长为____.
____,____,____,____,____,____