We ______the luggage for him. His brother did it for him.
| A．didn’t need carry | B．needn’t have carried |
| C．didn’t need to carry | D．needn’t carry |
The exhibition _____ such endangered animals as the giant panda and the Siberian tiger and describes the work being done to protect them．
| A．exploits | B．features |
| C．demonstrates | D．inspects |
If you completely ____ foods and drinks that you love， you'll only set yourself up to go on a large amount of those items later．
| A．take out | B．cut out |
| C．give out | D．put out |
Over the years, people have learned from ants that teamwork and perseverance are indeed two key ______ to success.
| A．certificates | B．ingredients |
| C．approaches | D．instructions |
If a friend snaps at you or is unfriendly， step back， and with a sense of compassion， try to experience life from his____．
| A．perspective | B．priority |
| C．privilege | D．policy |
It may be necessary to stop _____ in the learning process and go back to the difficult points in the lessons．
| A．at intervals | B．at random |
| C．at ease | D．at length |