Mrs.Smithlockedboththefrontandthebackdoorsbeforeshewenttobed______thatsomeonemightstealintothehouseatnight.
添加辅食不正确的是（）
肺炎患儿的护理诊断不正确的是（）
_____youunderstandthisrule，you‘llhavenodifficultyindealingwithsuchproblems.
Notallbirdscanfly,______doallbirdsbuildnests.
