Don’t stand up until you ____________.
| A．tell to | B．are told | C．are told to | D．are told to do |
No one knows ______ in the future, so take care of what we have now.
| A．what will happen | B．what are you going to be |
| C．what will our life be like | D．what the world would be like |
I'm a singer is a program ______ is enjoyed by people of different ages.
| A．who | B．whom | C．that | D．what |
A friend is a person who knows what you are saying ______ you are not talking.
| A．because | B．until | C．unless | D．even if |
It is true that knowledge ______ rather than being taught.
| A．learns | B．learned |
| C．is learned | D．was learned |
Don't give up, Tom. You haven't realized ______ great progress you've made!
| A．what | B．what a | C．how | D．how a |