Chinese students usually spend ______ the students of the US studying in their free time.
| A．twice as many hours as | B．as twice many hours as |
| C．twice hours as many as | D．as many as twice hours |
It was not _____ she took off her dark glasses _____ I realized she was a famous film star.
| A．when; that | B．until; that | C．until; when | D．when; then |
If we work with a strong will, we can overcome any difficulty, _____ great it is.
| A．what | B．how | C．however | D．whatever |
The man ____ visited our school yesterday is from London.
| A．who | B．which | C．whom | D．when |
The woman ____ is talking to my mother is a friend of hers.
| A．whose | B．who | C．whom | D．which |
Because of my poor memory, all ____ you told me has been forgotten.
| A．that | B．which | C．what | D．as |