Câu hỏi: I .................... your keys on the table by the bed last night.

A. saw

B. are seen

C. was seen

D. see

Câu 1: The harder this man works, ....................... he becomes.

A. most successful

B. more successful

C. the more successful

D. the most successful

Câu 2: Choose the correct answer A, B, C or D.

A. less convenient as

B. less convenient than

C. not so convenient than

D. the most convenient as

Câu 3: The electric light bulb ........................ by Thomas Edison.

A. invented

B. was invented

C. invents

D. is invented

Câu 4: 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 5: 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 6: Computers are considered as .................... tools today.

A. the most modern

B. more modern

C. modern as

D. much modern than