择下列合适的短语用适当的形式填空：1.after graduation 2.inform...of 3.so...that 4.read...aloud 5.in preparation for 6.at first 7.in charge

择下列合适的短语用适当的形式填空：1.after graduation 2.inform...of 3.so...that 4.read...aloud 5.in preparation for 6.at first 7.in charge 8.be required to (do sth)
1.He sharpened his knife( )cutting the meat.
2.Every student( )obey school rues.
3.How can he get a good job ( ) if he doesnot work hard now
老师最好解释为何如此应用,