_________ it not been for the intolerable heat in the hall, they would have stayed much longer.

A. whom    

B. whose     

C. that         

D. which

A. The Great Pyramid of Giza is said to have been built over a 20-year period.

B. The Great Pyramid of Giza are said to have been built over a 20-year period.

C. The Great Pyramid of Giza is said to have been built over a 20-years period.

D. The Great Pyramid of Giza is said to has been built over a 20-year period.

A. does a tiny violet flower emerge   

B. did a tiny violet flower emerge

C. emerge a tiny violet flower

D. emerged a tiny violet flower

A. weak and unprotected 

B. poor and disabled

C. deaf and mute

D. wealthy and famous

A. Although

B. fewer

C. too

D. top

A. It was not until he was nearly 30 so he passed his driving test.

B. It was until he was nearly 30 that he passed his driving test.

C. It was not until he was nearly 30 that he passed his driving test.

D. It was not until he was nearly 30 that he  has passed his driving test.