It was _____back home after the experiments.
| 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 |
_____unemployment and crime are high, it can be assumed that the latter is due to the former.
| A．Before | B．Where | C．Unless | D．Until |
Though ____ the dangers of smoking to their health, smokers still find it hard to give up smoking.
| A．aware | B．aware of | C．are aware of | D．be aware of |
---Do you work in this office?
---No, as a clerk in this office is on vacation, I’m just ____ here for about a week.
| A．hanging out | B．working out |
| C．turning out | D．helping out |
They _______ drinking although they are drivers, which is very dangerous both to them and the passengers.
| A．give up | B．devote themselves to |
| C．quit | D．abandon themselves to |
She had a computer at home, and her parents desired that she _____all her work at home.
| A．do | B．does | C．must do | D．would do |