Câu hỏi: Little have people done to alleviate the sea pollution caused by the factories in central Vietnam, haven’t they?

A. have people done

B. caused

C. in central

D. haven’t they

Câu 1: By measuring the color of a star, astronomers can tell how hot is it.

A. measuring

B. the

C. how

D. is it

Câu 2: I enjoy reading the article that you told me about it yesterday.

A. reading

B. that

C. told

D. it

Câu 3: Many languages used around the world they do not have a form of writing.

A. used

B. around

C. they

D. a form of writing

Câu 4: For thousands of years, man has created sweet-smelling substances from wood, herbs and flowers and using them for perfumes or medicine.

A. man

B. sweet-smelling

C. using them

D. or

Câu 5: Unlike the old one, this new copier can perform their functions in half the time.

A. unlike

B. can perform

C. their functions

D. in half the time

Câu 6: I was very busy lately since the project of designing the new collection started.

A. was

B. since

C. the project

D. the new collection