6. If there is a mechanical problem, we suggest ________ the manufacturer directly. A. contact B. to contact C. contacting D. to contacting 7. It is ________ that the best time to visit Hanoi is September. A. believed B. worth C. rumored D. wondered 8. It ________ that Po Nagar Cham Towers were built in the 8th century. A. considered B. was considered C. has considered D. considers 9. Hue’s most outstanding attractions are the emperors’_________. A. tombs B. graves C. cemetery D. cave 10. There is a growing _________ that protecting natural wonders has financial benefits as well as cultural importance. A. recognition B. setting C. complex D. spectacular CÁC BẠN GIẢI CHI TIẾT GIÚP MÌNH NHÁ