HOW ARE THE SEAS AND RIVERS NOWADAYS

31. How are the seas and rivers nowadays ? A. are contaminated B. cannot be swim in C. are dirty enough to swim in D. are less dirty than they used to be VI. Choose the best option to compelete each sentence. HUE IMPERIAL CITY The construction of the Imperial City started (31)______1805, under the reign of Emperor Gia Long, and (32)______completed in 1832, under the reign of Emperor Minh Mang. Built (33)______the northern bank of (34)______Perfume River, the Imperial City was influenced by the style of a French architect, Vauban. The city (35)______three sections: the Royal Citadel, the Imperial Enclosure and the Forbidden Purple City.