The water in the ocean also keeps the temperature of the earth steady by absorbing and _____heat.
| A．giving away | B．giving up | C．giving back | D．giving off |
Helen said she would come to my birthday party, but she hasn’t yet.
| A．dressed up | B．turned up | C．made up | D．broken up |
____some doubt among scientists about the cause of cancer.
| A．It exists | B．There exists | C．There is existing | D．It is existing |
---Try not to work yourself too hard. Take it easy.
--- Thanks. _________
| A．So what? | B．No way | C．What for? | D．You， too. |
The Harry Potter books are quite popular; they are in greatin this city.
| A． | quantity | B． | progress | C． | production | D． | demand |
The manager ______ the workers how to improve the program since 9 am.
| A．has told | B．is telling | C．has been telling | D．will have told |