Điền từ còn thiếu vào chỗ trống :

Hoan Kiem Lake is an attractive body of water right in the heart of Ha Noi. Legend has it that in the mid-15th  century, Heaven gave Emperor Le Thai To (Le Loi) a magical sword (1)_________ he used to fight against the Chinese, the Ming aggressors, out of Viet Nam. After that one day when he was out sailing in the lake, a giant  (2)_______  tortoise suddenly grabbed the sword and  disappeared  into the depths of the lake. Since then, the lake has been known as Hoan Kiem Lake (Lake of the Restored Sword)  (3)_______  it is believed the sword was taken to its original divine owners. The tiny Tortoise Pagoda, topped with a red star, is  (4)_______  a small island in the middle of the lake; it is often used  as an emblem of Ha Noi. Every morning around 6 a.m., local residents can be seen around Hoan Kiem Lake  (5)_______  their morning exercise, jogging or playing badminton.

 1.  A. which                           B. who                           C. whom                        D.  whose         

 2.  A. salty                              B.  huge                        C. gold                           D. golden                     

 3.  A. because                        B.  so                             C.  however                   D. although      

 4.  A. at                                   B. above                       C.  in                              D. on                             

 5.  A. to do                             B. doing                        C.  making                     D.  to make