We must keep our room clean, for dirt and disease go______.
| A．hand in hand | B．step by step | C．from time to time | D．one after another |
At first driving requires a lot of concentration, but over time, it just becomes_____.
| A．authentic | B．available | C．automatic | D．awake |
---Don’t climb the ladder. It’s broken.
---______
| A．Why not？ | B．Don’t mention it. | C．OK. Thank you. | D．So what? |
The dangerous building could fall down any time, but that’s a risk we’ll have to_____.
| A．do | B．take | C．perform | D．make |
I need to buy a new MP4 and cellphone badly but I can’t afford_____.
| A．one | B．that | C．it | D．the one |
I don't forget for ever how many years ago_____ was that I last met her in the coffee bar.
| A．this | B．it | C．which | D．when |