Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Not until the end of the 19th century ______ become a scientific discipline. 

A. plant breeding has 

B. did plant breeding 

C. plant breeding had 

D. has plant breeding 

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Up until the middle of the 19th century, there were no_______and well established anny nursing systems for casualties.

A. organize

B. organized

C. organizational

D. organizers

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Many natural resources_________by 1he end of the century.

A. had disappeared

B. have disappeared

C. disappeared

D. will have disappeared

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

He didn’t know    _______ or stay until the end of the festival

A. whether to go

B. if that he should go

C. to go

D. if to go

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

The minister ________ to say whether all the coal mines would be closed.

A. refused

B. avoided

C. denied

D. bothered

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

By the end of the 21st century, scientists _______ a cure for the common cold.

A. will find

B. will have found

C. will be finding

D. will have been finding

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

By the end of the 21st century, scientists _______ a cure for the common cold.

A. will find

B. will have found

C. will be finding

D. will have been finding

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

By the end of the 21st century, scientists ______ a cure for the common cold.

A. will find

B. will have found

C. will be finding

D. will have been found