My son has changed so much that I could hardly __________ his voice on the phone.
| A．recognize | B．realize | C．hear | D．find |
The time is not far away______modern communications will become widespread in China’s vast countryside.
| A．as | B．until | C．before | D．when |
The government has taken some measures to solve the shortage of electricity, but it may be some time ___________ the situation improves.
| A．since | B．when | C．unless | D．before |
You will see this product _____wherever you go.
| A．to be advertised | B．advertised | C．advertise | D．advertising |
Europe has achieved more in controlling the AIDS virus than Asia in the past ten years, _________ the number of people infected with the virus is going up sharply.
| A．when | B．that | C．so that | D．where |
Hardly ___________the door when he rushed into the office out of breath.
| A．I opened | B．did I open | C．I had opened | D．had I opened |