Exploring ________space is exciting, yet dangerous. There is ________need for both robots and humans for space exploration.
| A．the; a | B．a; a | C．/; a | D．/; the |
--- You won’t go to Mary’s wedding, will you?
--- No, _____ invited．
| A．if | B．once | C．though | D．in case |
According to a UN report, one third of the world population have no ____ to clean drinking water and health care．
| A．means | B．approach | C．channel | D．access |
It is likely that water is not ____ endless resource, nor ____ that can be made once more．
| A．the; / | B．an; one | C．an; that | D．/; one |
. Three days after Mrs White’s _______ necklace was found, she was _____ it.
| A．lost; robbed | B．Missed; robbed of |
| C．lost; robbed of | D．missing; robbed |
He will stop showing off, if no notice _________of him.
| A．is taken | B．will be taken | C．takes | D．has taken |