_______of the household rubbish___recycled or reused since the new technology was applied.
| A．Three-fourth; has | B．Three-fourths; have |
| C．Three-fourths; has been | D．Three-fourth; have been |
Only ______ do the job and only in this way _____ do the job well.
| A．can you; can you | B．you can; can you | C．you can; you can | D．can you; you can |
She was greatly shocked at the scene before her eyes. Never did she expect that local conditions___________be so awful.
| A．could | B．should | C．would | D．might |
Only when the villagers were faced with water shortage___ how serious the problem of water pollution was．
| A．did they realize | B．will they realize | C．they did realize | D．were they realized |
Only by practicing every day ___________ English well.
| A．can we learn | B．we can learn | C．did we learn | D．learn we |
Only when 1 was fourteen__________the importance of study．
| A．I realized | B．did I realize | C．had I realized | D．I had realized |