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

A. recommended

B. people

C. to take

D. exercise

Câu 1: My father asked me where had I gone the night before.

A. the

B. asked me

C. had I

D. before

Câu 2: My elder sisters, both of them were doctors, said they were too busy to pick me up.

A. elder

B. both of them

C. too busy 

D. to pick

Câu 3: 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 4: The bones of the elderly are more prone to fractures than of young people.

A. the elderly 

B. more

C. to

D. of

Câu 5: A smile can be observed, described, and reliably identify, it can also be elicited and manipulated under experimental conditions.

A. identify

B. experimental

C. can also

D. A smile

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

A. worst

B. the

C. before

D. tried