We were lucky enough， for no sooner _____ home _____ it rained.
| A．we returned， and | B．we had returned， when |
| C．did we return， when | D．had we returned， than |
Do you sometimes ignore loved ones because your life is too fast and busy leaving them _______ whether you really love them?
| A．wonder | B．to be wondering |
| C．wondering | D．wondered |
Do you have such an annoying colleague who plays the PC music ______ he were the only one working in the office?
| A．even if | B．as if |
| C．only if | D．now that |
Beijing was under an “orange” smog alert on Feb. 24, which marks the first time the second-highest warning level of a new system introduced last year_______.
| A．has been raised | B．raised |
| C．has risen | D．rose |
---Why are so many northern Chinese visiting Southeast Asia countries recently?
---They are trying to get a ________ shelter from the cold weather in winter.
| A．magic | B．temporary |
| C．permanent | D．reliable |
Research found that children who drank mainly soda were more than twice as likely as those who drank no soda _______ signs of aggression.
| A．showing | B．shown |
| C．to show | D．show |