More and more teaching _______ are being developed across the globe, which are sure to _______to make classroom teaching more lively and interesting

1. A.
   aids; help
2. B.
   assistance; help
3. C.
   aids; assist
4. D.
   helps; aid

More and more teaching _______ are being developed across the globe, which are sure to _______to make classroom teaching more lively and interesting.

　　 A. aids; help　　 B. assistance; help　 C. aids; assist　 D. helps; aid