—Look！Somebody ________ the sofa.
—Well，it wasn't me.I didn't do it.(2012·江西)
| A．is cleaning | B．was cleaning |
| C．has cleaned | D．had cleaned |
It's a common _______ for young people to pay a New Year's visit to their elders.
| A．sense | B．practice | C．rule | D．scene |
—Would you mind giving your advice on how to improve our business management?
—If you make ____ most of the modern equipment, there will be ____ rise in production．
| A．不填; 不填 | B．the; a | C．不填; a | D．the; 不填 |
---Have all the mysteries been cleared up?
--- Almost. But ______ only one question ______.
| A．there remains; answered | B．it remains; to be answered |
| C．there remains; to be answered | D．it remains; answered |
I will never forget my stay there I found my lost wallet.
| A．which | B．that | C．where | D．when |
Please tell me the after service of the computer; I’m worried about a breakdown sometime．
| A．there being | B．it being | C．there is | D．it is |