--- How many students are there in the classroom?
--- ______．All of them are practicing _____ the new song in the music hall．
| A．Nobody; singing | B．None; singing |
| C．Twenty; to sing | D．No one; to sing |
The research is so designed that once ______ nothing can be done to change it.
| A．begins | B．having begun | C．beginning | D．begun |
He is always______fault with other people though he doesn’t do his own work properly.
| A．seeking | B．looking | C．finding | D．putting |
Meeting my uncle after all these years was an unforgettable moment, ____ I will always treasure.
| A．that | B．one | C．it | D．what |
Hardly ______ when the bus suddenly pulled away.
| A．they had got to the bus stop | B．they got to the bus stop |
| C．did they get to the bus stop | D．had they got to the bus stop |
_____ leaves the room last ought to turn off the lights.
| A．Anyone | B．The person | C．Whoever | D．Who |