Rare species in the world, ______ by hundreds every year, must be jointly preserved by all countries, or humans will encounter ecological disaster in the near future.
A. disappeared B. disappearing C. disappear D.having disappeared
The joy of life is a deep spring. Only when digging deep ______ clear and sweet water.
A. you can draw B. did you draw C. can you draw D. you draw
The elderly patients still prefer the traditional way, ______ online booking system is supposed to be convenient and fast.
A. while B. though C. unless D. as
What do you think ______ makes the English version of the musical Notre Dame de Paris different from the previous ones?
A. is it that B. that it is C. that is it D. it is that
The fact that fun is not equal to happiness may be the opposite of ______ many people actually understand.
A. why B. that C. which D. what
The threats to the health of astronauts in space are very different from ______ on earth.
A. ones B. that C. it D. those
