18. It was ______ back home after the experiment.
| A．not until midnight did he go | B．until midnight that he didn’t go |
| C．not until midnight that he went | D．until midnight when he didn’t go |
---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 |
It was a(n) _____situation, because the restaurant was too expensive for us but we didn't want to just leave.
| A．amazing | B．curious | C．desperate | D．awkward |