4. I find carving wood boring because it takes time. A. I think carving wood boring because it takes time. B. I think carving wood is boring because it takes time. C. I think carving wood was boring because it takes time. D. I think carve wood is boring because it takes time. 5. She / have / opportunity / study / Australia /last year. A. She has had an opportunity to study in Australia last year. B. She had an opportunity studying in Australia last year. C. She has an opportunity studying in Australia last year. D. She had an opportunity to study in Australia last year. 6. It’s difficult for Hoang to earn his living. A. Hoang finds it difficult earning his living. B. Earning his living is difficult for Hoang C. Hoang finds it difficult earn his living. D. To earn his living are difficult for Hoang.