Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 35 to 44.
A. systems
B. sounds
C. languages
D. talks
* Đáp án
* Hướng dẫn giải
Đáp án : B
Sound = âm thanh. Language = ngôn ngữ. System = hệ thống.