When the boss came in, these workers pretended to________ carefully.
| A．working | B．be working |
| C．work | D．have been working |
The tomato juice left brown ____ on the front f my jacket．
| A．spots | B．points | C．tracks | D．traces |
—Have you seen Rose recently?
— No．It’s five years _____ I met her．
| A．since | B．after | C．when | D．before |
The single most important factor ____ contributes to success is _____ you do every single day．
| A．that; that | B．which; what | C．which; what | D．that; what |
Most of the professors _____ to our school were from South Africa．
| A．invited | B．to be invited |
| C．being invited | D．had been invited |
They all looked ____ at the master and felt quite _____．
| A．sad; sad | B．sadly; sadly |
| C．sad; sadly | D．sadly; sad |