We must __________ that the experiment is controlled as rigidly as possible.
| A．propose | B．secure | C．ensure | D．Issue |
much work you have to do every day，do get enough sleep．
| A．However | B．Whichever | C．Whatever | D．Whenever |
How did it that the child dropped out of school?
| A．come in | B．come about | C．come across | D．come on |
The government has handed out all the food and clothes to the victims．
| A．reflected | B．abandoned | C．donated | D．rented |
We want to buy the same computers are being used in your office．
| A．which | B．as | C．that they | D．as they |
—What's your of Frank as a boss?
—Honest．
| A．impression | B．influence | C．respect | D．attitude |