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Here are the answers: 3. A. I recommend visiting the museum while you're here 4. A. I suggest that the house should be repainted 5. B. She asked me if I am willing to travel. 6. A. Sue lives in the house which is opposite my house. Here are the correct answers: 1. Mars, which is also called the Red Planet, is very much similar to Earth. -> B. which is also called the Red Planet 2. We were interested in the talk by Mr. An, who explained ecological balance to us. -> C. who explained ecological balance to us 3. The Alps are a well-known mountain range, which attract many tourists worldwide. -> C. that attract many tourists worldwide (Correct answer is 'that' instead of 'which') 4. Deserts on Earth, which are large and extremely dry areas, hardly get any rain. -> C. which are large and extremely dry areas 5. We spent time trekking, bird-watching, and kayaing in Cuc Phuong, which is the oldest national park in Viet Nam. -> B. which is the oldest national park in Viet Nam 6. James Button, whose work in geology is considered very important, was one of the first scientists to study geology. -> A. whose work in geology is considered very important