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: The world is becoming more industrialized and the number of animal species that have become extinct have increased.

A. industrialized

B. species

C. extinct 

D. have

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: Neither of the men arresting as terrorists would reveal information about his group.

A. Neither

B. arresting

C. would reveal

D. his group

Câu 4: My pen has very few ink in it, so could you give me some

A. has 

B. few ink

C. could

D. some

Câu 5: The harder he tried, the worst he danced before the large audience.

A. worst

B. the

C. before

D. tried

Câu 6: Students suppose to read all the questions carefully and find out the answers to them.

A. suppose

B. all the

C. all the questions

D. them