This photo of mine was taken __________ stood the famous twin-tower before the 9.11 event.
| A．which | B．in which | C．where | D．there |
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 |