Câu hỏi: The electric light bulb ........................ by Thomas Edison.

A. invented

B. was invented

C. invents

D. is invented

Câu 1: In 1850 ........................ established one of the first detective agencies in theUnited States.

A. it was detectivePinkerton

B. detective Pinkerton 

C. detective Pinkerton who

D. when detectivePinkerton

Câu 2: Computers are considered as .................... tools today.

A. the most modern

B. more modern

C. modern as

D. much modern than  

Câu 3: Samuel Clemens, ................ under the pen name Mark Twain, createdcharacters that reflected purely American life.

A. he wrote

B. was writing

C. wrote

D. who wrote

Câu 4: Books .............. of leather are longer lasting than books that are made of paper.

A. made

B. are made

C. making 

D. which made

Câu 5: The journey, ........................ alone for most of the way, was in the name of charity.

A. I undertook

B. that I undertook

C. which I undertook

D. undertaking

Câu 6: In 1849, Walter Hunt, ...................... American inventor, patented a designthat served as the basis for modem safety pins.

A. an

B. he was an

C. who

D. was an