Two languages, Finnish and Swedish, are used in Helsinki. It is the capital of Finland. 4. The Washington National Monument is a famous landmark in the nation's capital. It is a towering obelisk made of white marble. 5. Honolulu has consistently pleasant weather. It is best known to the traveler for Waikiki Beach. 6. Libya is a leading producer of oil. It is a country in North Africa.

Rewrite

3. Two languages, Finnish and Swedish, are used in Helsinki which is the capital of Finland

-> Đại từ quan hệ which thay thế cho cụm danh từ Two languages, Finnish and Swedish

4. The Washington national monument is a famous landmark in the nation's capital whose towering obelisk is made of white marble

-> Đại từ quan hệ whose thay thế cho dt sở hữu 

5. Honolulu, which is best known for Waikiki beach to the traveller, has consistenly pleasant weather

-> Which thay thế cho N Honolulu

6. Libya, which is a country in North Africa, is a leading producer of oil

-> Which thay thế cho N Libya