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: 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 2: 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 3: 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 4: Florida ............... by thousands of tourists every winter.

A. visited

B. visits

C. was visited

D. is visited

Câu 5: Choose the correct answer to fill in the blank. 

A. that are

B. being

C. are

D. are being

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

A. the most modern

B. more modern

C. modern as

D. much modern than