| Meaning | Usage | ||
| A. | A message for belief action or argument | E. | He was at loss to explaining what ground he had decided to take up the case | 
| B. | Foundation | F. | He received a thorough grounding in the theoretical aspects before he was allowed to move on | 
| C. | To provide a reason or justification for | G. | He realised he was on a shaky ground when the principal questioned him | 
| D. | To instruct in Fundamental principal | H. | The book has provided the philosophical ground for most of the Nazi policies | 

Fill in the blank with the correct option. 
The teacher believed that the student’s sudden lack of interest in class was an ..........., as he had always been enthusiastic and attentive.