Sit down, Emma．You will only make yourself more tired,________on your feet．
| A．to keep | B．keeping |
| C．having kept | D．to have kept |
I _______ the dance performance many times, each giving me a new understanding.
| A．watch | B．watched | C．have watched | D．am watching |
The economic impact study was conducted by a group of _______ selected MBA students at the University of Kansas.
| A．especially | B．specially | C．regularly | D．potentially |
_______ any other species, human populations are shaped by the usual forces of natural selection, like famine, disease or climate.
| A．Compared with | B．As with | C．As for | D．In addition to |
— I’m terribly sorry to keep you waiting for so long.
— _______.
| A．Never mind. | B．That’s right. | C．You are welcome. | D．Don’t mention it. |
It’s extremely dangerous for the drivers to _______ speed as the traffic lights are changing.
| A．pull up | B．put up | C．rise up | D．pick up |