However, when ______teams to complete tasks at school, we are often hardly aware of this.

However, when ______teams to complete tasks at school, we are often hardly aware of this.

1. A.
   forming
2. B.
   to form
3. C.
   formed
4. D.
   be forming

However, when ______teams to complete tasks at school, we are often hardly aware of this.

  A. forming        B. to form       C. formed      D. be forming

However, when ______teams to complete tasks at school, we are often hardly aware of this.