. When talking about his road to success in an interview, he owed his success ______ his mother.
| A．for | B．in | C．on | D．to |
The time is not far away ________ modern communications will become widespread in China’s vast countryside.
| A．as | B．when | C．until | D．before |
I hope that the little ________ I have been able to do does good to them all.
| A．which | B．what | C．that | D．when |
I hope that the little ________ I have been able to do does good to them all.
| A．which | B．what | C．that | D．when |
There are several research centers in China ________ a certain disease called Bird Flu is being studied.
| A．which | B．where | C．when | D．what |
The treatment will continue until the patient reaches the point ________ he can walk correctly and safely.
| A．when | B．where | C．which | D．whose |