Câu hỏi: 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 1: Books .............. of leather are longer lasting than books that are made of paper.

A. made

B. are made

C. making 

D. which made

Câu 2: The electric light bulb ........................ by Thomas Edison.

A. invented

B. was invented

C. invents

D. is invented

Câu 3: 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

Câu 4: I ..................... you a copy of the article tomorrow.

A. send

B. was sending

C. will send

D. will be sent

Câu 5: 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 6: Hotels have developed ................... restaurants in this area.

A. as rapid as

B. as rapid than

C. so rapidly that

D. as rapidly as