It was said was how the Chinese first raised silk worms.
| A．that what |
| B．that which |
| C．that who |
| D．that that |
You must do your homework now; you ________ computer games all the evening.
| A．have been playing | B．are playing |
C．play | D．played |
Keep your minds ________ to different ideas, or you will not be successful.
| A．opening | B．to open | C．open | D．opened |
— ________ your brother said to you?
— He encouraged me to talk to foreigners more often.
| A．What it was that | B．What was it that |
| C．How it was that | D．How was it that |
________ you are responsible for the information, you must be very careful.
| A．Unless | B．While | C．Since | D．Though |
The site ________ now is an amusement park, which will be open to thepublic at the end of this year.
| A．being built | B．having been built | C． built | D．to be built |