The research is so designed that once __________ nothing can be done to change it.
| A．begins |
| B．having begun |
| C．beginning |
| D．begun |
—Could I use your dictionary?
—Sorry, it __________.
| A．is using | B．was using | C．was used | D．is being used |
At the sight of her mother,the surprise in her face was ____ by joy.
| A．taken place | B．replaced | C．in place of | D．instead of |
___________ and I’ll get the work finished.
| A．Have one more hour | B．One more hour |
| C．Given one more hour | D．If I have one more hour |
The harder you work at your lessons, the greater progress you ________.
| A．will make | B．make | C．have made | D．made |
--- She has been ill for a week.
----- I _____ with her at noon tomorrow.
| A．stayed | B．stay | C．am staying | D．shall be staying |