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: Having finished his tem paper before the deadline, it was delivered to professor before the class.

A. having finished

B. before

C. it was delivered

D. before

Câu 2: My father asked me where had I gone the night before.

A. the

B. asked me

C. had I

D. before

Câu 3: The harder he tried, the worst he danced before the large audience.

A. worst

B. the

C. before

D. tried

Câu 4: Neither William or his brother stole the rambutans from our orchard.

A. or 

B. stole 

C. from

D. our orchard

Câu 5: 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

Câu 6: My pen has very few ink in it, so could you give me some

A. has 

B. few ink

C. could

D. some