—How can I improve my spoken English?

—You have to practice _______ as much as you can.[ ]

A. speak        

B. speaking          

C. spoken        

D. to speak

预防破伤风最有效最可靠的方法是（）

A.彻底清创

B.应用青霉素

C.注射TAT

D.注射人体破伤风免疫球蛋白

E.注射破伤风类毒素