The professor said he could talk on _____ interested the audience.
| A．any topic | B．which topic |
| C．whichever topic | D．the topic he thought it |
The reason _____he has just given for not coming to the meeting is______ he missed the bus..
A which; that B. why; that C. . for which; because D. that; why
In the past twenty years great changes _______in China.
| A．were taken place | B．have been taken place |
| C．have taken place | D．were happened |
The old city wall ______ in the Ming Dynasty.
| A．was been built | B．has been built | C．was built | D．had been built |
The doctors have done ______ they could ______the child.
| A．whatever; to save | B．everything ; save |
| C．all what; to save | D．all which; save |
The teacher asked the students ______ .
| A．how did that come about | B．how that came about |
| C．that how this came about | D．how that was happened |