Câu hỏi:

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35.  

          Mark and Delia Owens have been working to save endangered species for many years. They met at university and married shortly after (31)_____ taken their degrees. Then they sold all their possessions and bought one-way tickets to Botswana, in southern Africa. (32)_____ they wanted to do in Botswana was to study lions in a natural setting, but they had hardly any money. They (33)_____ camp in a remote valley in the Kalahari desert, over eight hours’ drive from the nearest town. They were so poor that they could only buy petrol to drive to town once every few months, and the rest of the time they were completely on their own. It was a (34)_____ life, but sometimes dangerous. One night, when they were camping out in the desert, they woke up to find they were surrounded by nine lions. But they knew that the lions had probably eaten recently, so they were probably not (35)_____ much danger. After seven years, Mark and Delia left Botswana to continue their work elsewhere, but they never forgot the lions they had come to know and love.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blank 31.