Đáp án C
When you put one finger in front of your mouth, you mean, "Be quiet.": Khi bạn đặt một ngón tay trước miệng, ý bạn là, “Yên lặng.”
Surprisingly, however, psychologists (99)________ that most victims are middle-aged housewives who have never used a computer before.
Undoubtedly, medical science will continue to (15) ________. Some people will be able to avoid medical problems that are unavoidable today.