The teacher is smiling at the girl.中at的作用?译为“老师在对着女孩微笑.为什么用at呢?对着谁‘笑’、‘哭’等表达表情时都用at吗?

the teacher is very (the teacher is very ( ) her students. The teacher is busy ______teaching. observation is the best teacher The teacher is very h___. Is the teacher's office 几道英语填空,（在横线内填入合适的词,使其通顺,首字母已给.）The food in the restaurant is cheap and g_____.In a few weeks his restaurant is always full of men with t_____.Eery time a gentleman comes i______with a lady,a smili he is listening to the teacher.对the teacher 提问 how is the teacher?改为同义句( )( ) the teacher ( 英文the new English teacher is in the teacher Is the tiger the cat's teacher? our English teacher is our the head teacher. I'm a teacher ( )the woman is a teacher ,too. shi is a good teacher?(改为感叹句）（）a()teacher!()()the teacher is! Is the students' english teacher old or The teacher is walking t___ us The teacher is good ( ) her student. The teacher is very kind.划线提问 Thomas is crying.the teacher asks him