Câu hỏi: Commercial centers are ................ they were many years ago.

A. as popular than

B. the most popular

C. the most popular than

D. more popular than

Câu 1: 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 2: Ansel Adams was a landscape photographer ............................. photographs show the nature of the western United States.

A. of his

B. whose 

C. of whom

D. his

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

A. invented

B. was invented

C. invents

D. is invented

Câu 4: Choose the correct answer to fill in the blank. 

A. that are

B. being

C. are

D. are being

Câu 5: 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 6: The harder this man works, ....................... he becomes.

A. most successful

B. more successful

C. the more successful

D. the most successful