If you just spend your time___ gains and losses, maybe you'll get nothing in the end．
| A．checking | B．weighing | C．balancing | D．examining |
Working hard is not only a __________ of great success, but it is among the essential requirements.
| A．sign |
| B．signal |
| C．mark |
| D．guarantee |
The new product was __________ in 2011 and will be put into use in 2012.
| A．found out |
| B．stuck out |
| C．sorted out |
| D．tested out |
Listen! Do you hear someone __________ for help?
| A．calling |
| B．call |
| C．to call |
| D．called |
Your house is always so neat—how do you __________ it with three children?
| A．manage |
| B．serve |
| C．adapt |
| D．construct |
Why don't you bring __________ to his attention that you're too ill to work on?
| A．that |
| B．it |
| C．this |
| D．him |