Câu hỏi: Proteins are made up of folded irregularly chains, the links of which are amino acids.

A. made up of

B. folded irregularly

C. the links

D. which

Câu 1: Folklore consists of the beliefs, customs, traditions, and telling stories that people pass from generation to generation.

A. Folklore

B. the

C. telling stories

D. generation

Câu 2: The bones of the elderly are more prone to fractures than of young people.

A. the elderly 

B. more

C. to

D. of

Câu 3: It is recommended that people to take regular exercise.

A. recommended

B. people

C. to take

D. exercise

Câu 4: My father asked me where had I gone the night before.

A. the

B. asked me

C. had I

D. before

Câu 5: The number of students attending universities to study economics have increased steadily in the last few years.

A. of students

B. attending

C. economics

D. have

Câu 6: The harder he tried, the worst he danced before the large audience.

A. worst

B. the

C. before

D. tried