The research is so designed that once _______ nothing can be done to change it.
| A．begins | B．having begun |
| C．beginning | D．begun |
The university with two____ campuses has a student population of 50,000 in total．
| A．unique | B．separate | C．single | D．alternative |
Faced with_______ failure, it is the most important for us to keep up ______good state of mind.
| A． / ; a | B． a ; / | C． the ; / | D．/ ; the |
All the tourists _______ about the bad service in that restaurant.
| A．explained | B．expressed | C．promoted | D．complained |
We are going to ________ a dinner party on New Year’s Eve.
| A．do | B．have | C．play | D．join |
In Germany, you shouldn’t arrive late to a dinner party; you should always be ___.
| A．on time | B．at times | C．in time | D．for a time |