No matter how much knowledge you have, if your subject is at all ______, be careful when discussing it during your speech, or you may well offend your audience.
| A．diverse | B．sensitive |
| C．abstract | D．original |
It is the third time that she has won the race, ______ has surprised us all．
| A．that | B．where | C．which | D．what |
English is a language shared by several diverse cultures, __________ uses it differently.
| A．all of which | B．each of which |
| C．all of them | D．each of them |
The woman burst into tears ________she was announced the winner.
| A．that | B．instantly |
| C．unless | D．in case |
Just be patient．You _____ expect the world to change so soon．
| A．can’t | B．may not |
| C．needn’t | D．didn’t |