The invention of artificial hearts marked a turning point in the battle heart disease.
| A．among | B．for | C．against | D．between |
Last night, Bob made a call to me, ______sorry for his absence from my wedding ceremony.
A sayB. saying
C. said D. to have said
______we cannot close the gulf between us, we can try to bridge it so that we may be able to talk across it.
| A．Unless | B． As | C．While | D．If |
_____he misunderstood my position on the problem was obvious from his comments.
| A．Which | B．Where | C．That | D．What |
____once a year by fire officials, whether a school is large of small, is a regulation that must be carried out in this country.
| A．Inspected | B．Being inspected |
| C．Inspecting | D．Having been inspected |
We were delayed at the airport. Otherwise, we_______ here by lunch time.
| A．must be | B．must have been |
| C．would be | D．would have been |