________ is known to us all, our government has spared no efforts to control food prices.
| A．What | B．Which |
| C．As | D．It |
Our manager never fails to answer a phone call ______ she is very busy.
| A．since | B．once | C．even if | D．so that |
Because of the lack of funds, the tunnel project has already fallen behind ________.
| A．situation | B．speed | C．insurance | D．schedule |
The book is rather highly priced, but so well worth ______ that it should be begged or borrowed rather than missed.
| A．to read | B．to be read | C．reading | D．being read |
It was on the last day ______ a press conference was held by some committee members.
| A．where | B．that | C．when | D．how |
---What does Old Walter usually do in his retirement?
---- These days he is ______ memories of village life for his new book.
| A．putting up | B．putting on | C．setting up | D．setting down |