All the photographs in this book, ____ stated otherwise, date from the 1950s.
| A．once | B．until |
| C．unless | D．if |
All the materials have been posted to you. I’m looking forward to the chance to meet you __________ to discuss the present situation of our company.
| A．in peace | B．in return | C．in trouble | D．in person |
Some pills many people take to achieve or maintain their desired weight will lower their life expectancy_____ they contain something harmful．
| A．so that | B．in that | C．even if | D．as if |
We shall not start the project until it __________ by the committee.
| A．will be approved | B．approves |
| C．has been approved | D．is to approve |
Bears ______ fat stores throughout the summer and fall to have energy enough to last them through their winter sleep.
| A．pack up | B．build up |
| C．bring up | D．take up |
With many cities in China dreadfully blanketed by thick haze, the environmental problem is _____ Chinese people concern most nowadays.
| A．what | B．which | C．where | D．when |