Câu hỏi: 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 1: 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 2: My father asked me where had I gone the night before.

A. the

B. asked me

C. had I

D. before

Câu 3: If they took their language lesson seriously, they would be able to communicate with the locals now.

A. took

B. seriously

C.  would be

D. with the locals

Câu 4: The harder he tried, the worst he danced before the large audience.

A. worst

B. the

C. before

D. tried

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

A. or 

B. stole 

C. from

D. our orchard