At minus 130℃, a living cell can be __________ for a thousand years.
| A．spared |
| B．protected |
| C．preserved |
| D．developed |
.I can’t answer for ________ that the boy is honest.
| A．it | B．me | C．which | D．them |
. Why shouldn’t I buy a new coat — I haven’t bought _____ for five years.
| A．it | B．that | C．one | D．which |
. He made _____ known to his friends that he didn’t want to enter politics.
| A．that | B．it | C．himself | D．him |
. It used to be thought _____ the Earth was flat.
| A．as | B．when | C．since | D．that |
. In the west, people make _______ a rule to send Christmas present to their relatives and friends.
| A．this | B．that | C．it | D．the following |