—Did you return Fred's call?
—I didn't need to ________ I'll see him tomorrow.
| A．though | B．unless | C．when | D．because |
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 |