At minus 130℃, a living cell can be ______ for a thousand years.
A. spared B. protected C. preserved D. developed
The traditional view is ______ we sleep because our brain is “programmed” to make us do so.
A. when B. why C. whether D. that
______ he referred to in his article was unknown to the general reader.
A. That B. What C. Whether D. Where
Small sailboats can easily turn over in the water ______ they are not managed carefully.
A. though B. before C. until D. if
His movie won several awards at the film festival, ______ was beyond his wildest dream.
A. which B. that C. where D. it
The Town Hall ______ in the 1800’s was the most distinguished building at that time.
A. to be completed B. having been completed
C. completed D. being completed
