CHILDREN CAN HELP CONSERVE THE ENVIRONMENT BY ______MINI-PROJECTS....

25. - DE KIEM TRA HK2 LOP 10
DE KIEM TRA HK2 LOP 10

25. Children can help conserve the environment by ______mini-projects.

A. practise B. to practise C. practising D. practised

Choose the underlined part that needs correcting.