If he __ harder, he will catch up with us soon.
                    举一反三
- If he_______harder,he will catch up with us soon. A: study B: studies C: will study D: studied
 - He walked ________ fast for us ________catch up with.
 - He _________ to us as soon as he gets there.
 - He walked ________ fast for us ________catch up with. A: so, that B: such, that C: enough, to D: too, to
 - He walked ______ fast for us ______ catch up with. A: so; that B: B. enough; to C: C. too; to
 
