A. designs
Đáp án C
– hai động từ nối liền nhau có dạng V + V-ing hoặc to V diễn tả 2 hoạt động bổ sung nghĩa cho nhau.
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.