Câu hỏi: 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 1: Florida ............... by thousands of tourists every winter.

A. visited

B. visits

C. was visited

D. is visited

Câu 2: I ..................... you a copy of the article tomorrow.

A. send

B. was sending

C. will send

D. will be sent

Câu 3: 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 4: The electric light bulb ........................ by Thomas Edison.

A. invented

B. was invented

C. invents

D. is invented

Câu 5: Hotels have developed ................... restaurants in this area.

A. as rapid as

B. as rapid than

C. so rapidly that

D. as rapidly as

Câu 6: Choose the correct answer to fill in the blank. 

A. that are

B. being

C. are

D. are being