The first thing_______ I am going to do this evening is to write to my father.

If you ________, you should put your head back and clean your face.

下列各句中加横线的词，解释有误的一项是（ ）

230 The little boy likes plane models verymuch He wants to be a _______and fly a plane into the sky when he grows up

fraid you missed a fantastic lecture yesterday. How come you were absent from it—If you _______ know, I asked for a day off and visited a relative of mine in hospital.