1-C. Opera is an art form that celebrates the human voice at its highest level of expression.Opera is an art form that celebrates the human voice at its highest level of expression.
オペラは、芸術形式です、それは、人間の声を祝います、その最高レベルでダヨ、表現のダヨ。
2-C. The first set, called the Eight-thousanders (8000ers,) consists of the 14 mountain peaks higher than 8,000 meters above sea level, which are all in Asia.The first set, called the Eight-thousanders (8000ers,) consists of the 14 mountain peaks higher than 8,000 meters above sea level, which are all in Asia.
3-C. They should also be written at a level that children can easily understand.They should also be written at a level that children can easily understand.
4-C. The number of trips made per person each year did begin to increase in the 1970s but then started to level off in the 1990s.The number of trips made per person each year did begin to increase in the 1970s but then started to level off in the 1990s.
5-C. If you're going to Machu Picchu in highland Peru, you should consider visiting Cuzco, at 3,400 meters above sea level.If you're going to Machu Picchu in highland Peru, you should consider visiting Cuzco, at 3,400 meters above sea level.