1. I was late because I **underestimated** how much time I would need. (estimate)
   
2. I don't care if you'd had too much to drink. Your behaviour last night was quite **indefensible**. (defend)
   
3. The cat is in the sunshine **luxuriously**. (luxury)
   
4. Don't judge the matter by my opponent's **lateral** statement, but wait till you have heard the other side. (lateral)
   
5. Some phones can recognize your voice and **act** accordingly. (act)
   
6. Are all those **additives** they put in food really necessary? (add)
   
7. The bicycle I lent Tom had been in good condition, but he returned it in **disrepair**. (repair)
   
8. I might lose my **vision** on an occasion when I might be 600 feet below sea level. (vision)
   
9. **Deforestation** and overpopulation are two of the most difficult problems in the Third World countries. (forest)