1.You will be able to get good marks ______

A,while you are doing your bomework by your self

B,if yor do some revision every day

C,before you follow your teachers^,_advice

_{^{2.Do you know _____________?}}

_{^{Sorry,bur if he _________back,I____________you know as soon as possible.}}

_{^{A,when will he be back ,comes,will let}}

_{^{Bwhen he will be back,will come,will let}}

_{^{C,what time will he be back ,will come,let}}

_{^{D,what time he will be back,comes ,will let}}