Câu hỏi: Developing new technologies are time-consuming and expensive.

A. developing 

B. technologies

C. are

D. time-consuming

Câu 1: By the time Robert will finish writing the first draft of his paper, most of the other students will have completed their final draft.

A. will finish

B. writing

C. most

D. their

Câu 2: The number of women earning Master's Degrees have risen sharply in recent years.

A. number

B. earning

C. have risen

D. recent years

Câu 3: The longer the children waited in the long queue, the more impatiently they became

A. the longer

B. waited

C. the long queue

D. impatiently

Câu 4: Each of the beautiful cars in the shop was quickly sold to their owner.

A. Each

B. cars

C. quickly

D. their

Câu 5: 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 6: The earth is the only planet with a large number of oxygen in its atmosphere.

A. the

B. number

C. oxygen

D. its