Exercise 6: Underline the mistake in each sentence. 1. I’d like buying some earrings like yours. 2. She smelt something burning and saw smoke rise. 3. I warned them not climb the mountain in such bad weather. 4. They voluntarily spent their vacations to teach illiterate people to read and write. 5. You can congratulate yourself about having done an excellent job. 6. Peter apologized for break the vase. 7. He insisted on seeing the manager tomorrow. 8. Some high school students take part in help the handicapped. 9. Shy people find it difficult taking part in group discussion. 10. I am unable come to the meeting on Monday evening, please apologize for my absence.