Had it been possible I would have gone to the movies, but I _______ busy.
| A．had been | B．am | C．was | D．would be |
Russia will soon return 174 sq km of territory on the northeast border to China, ______
more than 40 years of negotiations．
| A．ending | B．ended | C．to end | D．being ended |
Modern China is experiencing a completely new period_____respect for science and creativity has become the guiding principle of society．
| A．which | B．where | C．in which | D．that |
Traffic restrictions have come into effect in Beijing ______to improve the capital’s air quality and traffic situation for the 2008 Olympics．
| A．in order that | B．in an attempt | C．at an attempt | D．in a try |
President Hu Jintao urged that every effort to_____rescue and treat the injured when the earthquake happened in Sichuan this year．
| A．is made | B．must be made | C．should make | D．be made |
Platypus is a strange animal that lays eggs but _____ milk _____ its young．
| A．feeds；to | B．feeds；for | C．fed；at | D．fed；on |