Tiến hành các thí nghiệm sau:

(1) Cho Mg vào dung dịch Fe₂(SO₄)₃ dư                 (2) Sục khí Cl₂ vào dung dịch FeCl₂

(3) Dẫn khí H₂ dư qua bột CuO nung nóng              (4) Cho Na vào dung dịch CuSO₄ dư

(5) Nhiệt phân AgNO₃                                              (6) Đốt Fe₂S trong không khí

(7) Điện phân dung dịch CuSO₄ với điện cực trơ

Sau khi kết thúc các phản ứng, số thí nghiệm thu được kim loại là

A. 4

B. 3C. 2

C. 2

D. 5

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

People say that Carter was the best director of his time.

A. Carter is said to have been the best director of his time. 

B. Carter is said to be the best director of his time. 

C. Carter was said to be the best director of his time. 

D. It was said that Carter was the best director of his time.