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

A. invented

B. was invented

C. invents

D. is invented

Câu 3: Willa Cather, ....................... a prominent American writer, grew up in Nebraska during the early farming years. 

A. who became

B. became

C. she became

D. it is she who became

Câu 4: Computers are considered as .................... tools today.

A. the most modern

B. more modern

C. modern as

D. much modern than  

Câu 5: The harder this man works, ....................... he becomes.

A. most successful

B. more successful

C. the more successful

D. the most successful

Câu 6: 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