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: Choose the correct answer to fill in the blank. 

A. that are

B. being

C. are

D. are being

Câu 2: Florida ............... by thousands of tourists every winter.

A. visited

B. visits

C. was visited

D. is visited

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

A. saw

B. are seen

C. was seen

D. see

Câu 6: The electric light bulb ........................ by Thomas Edison.

A. invented

B. was invented

C. invents

D. is invented