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

A. the elderly 

B. more

C. to

D. of

Câu 1: 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 2: 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 3: My pen has very few ink in it, so could you give me some

A. has 

B. few ink

C. could

D. some

Câu 4: It is recommended that people to take regular exercise.

A. recommended

B. people

C. to take

D. exercise

Câu 5: Each of the members of the group were made to write a report every week.

A. were

B. members

C. to write

D. week

Câu 6: Although most species of small birds gather in groups at feeders provided by bird-watchers, the bright red cardinals usually appears alone or with its mate.

A. at

B. cardinals

C. or

D. its