91. ______ finding solutions, it is unthinkable to solve all the problems the same way throughout the country.
| A．As if | B．As of | C．As for | D．As against |
－－Can you finish the writing on time?
－－_________.
| A．Never mind | B．With pleasure |
| C．No problem | D．All right |
Is oxygen the only gas _______ helps fire burn?
| A．that | B．/ | C．which | D．it |
During the days ________, he worked as a servant at the Browns.
| A．followed | B．following | C．to follow | D．that followed |
The number of the people who _______ cars _______ increasing.
| A．owns; are | B．owns; is | C．own; is | D．own; are |
I shall never forget those years _______ I lived on the farm with
the farmers, _______ has a great effect on my life.
| A．when; who | B．that; which | C．which; that | D．when; which |