The medicine has begun to ___
| A．have its work | B．take its work | C．do its work | D．show its work |
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 |
He kept looking at her, wondering whether he her somewhere.
| A．saw | B．has seen | C．sees | D．had seen |
---How long has your brother been working here?
---_______ he graduated from college in 2007.
| A．When | B．Until | C．Long before | D．Ever since |
Tom insisted what he said ______ true, but we insisted that he _____ and have a look.
| A．be, should go | B．should be, would go | C．was, go | D．was, would go |
I’d prefer ______ in the office rather than ______ at home watching TV.
| A．working, staying | B．working, stay | C．to work, stay | D．work, to stay |