4._______ water to grow is well-known.
| A．That trees need | B．These trees need | C．That tree needs | D．Trees need |
Just as Oprah Winfrey puts it, ______ thankful for what you have and you'll end up having more.
| A．be | B．being | C．to be | D．having been |
At the end of the game, players traditionally ______ their shirts with each other.
| A．substitute | B．iron | C．swap | D．transform |
It is generally believed that communication skills are becoming ______ it takes to be a good doctor.
| A．whether | B．that | C．how | D．what |
It is our choices that show what we truly are, far ______ our abilities.
| A．more than | B．less than |
| C．as good as | D．as well as |
The university is saving $ 300,000 per year by its energy ______ efforts.
| A．consumption | B．conservation |
| C．suspension | D．prohibition |