Such a great event __________ that it will attract governments and people from across the world to Shanghai．
| A．is World Expo 2010 | B．World Expo 2010 is |
| C．has World Expo 2010 been | D．World Expo 2010 has been |
I had hardly got to the office ______ my wife phoned me to go back home at once.
| A．when | B．than | C．until | D．after |
—Look at those clouds!
—Don’t worry. ______ it rains, we’ll still have a great time.
| A．Even if | B．As though | C．In case | D．If only |
All the photographs in this book, _______ stated otherwise, date from the 1950s.
| A．unless | B．until | C．once | D．if |
Hot _______the night air was, we slept deeply because we were so tired after the long journey.
| A．although | B．as | C．while | D．however |
If you happen to get lost in the wild, you’d better stay ______ you are and wait for help.
| A．why | B．where | C．who | D．what |