His sister left home in 1998, and_______ ever since.
| A．had not been heard of | B．has not been heard of |
| C．had not heard of | D．has not heard of |
One's life has value __________ one brings value to the life of others.
| A．so that |
| B．no matter how |
| C．as long as |
| D．except that |
It's much easier to make friends __________ you have similar interests.
| A．unless |
| B．when |
| C．even though |
| D．so that |
Allow the children to voice their opinions，__________ they are different from your own.
| A．until |
| B．even if |
| C．unless |
| D．as though |
Nobody but doctors and those __________ by Dr Smith __________ to enter the patient's room.
| A．invited; is allowed |
| B．invited; are allowed |
| C．being invited; is allowed |
| D．being invited; are allowed |
__________ her foot wounded so seriously, she had to give up this game.
| A．For |
| B．When |
| C．With |
| D．While |