Voices were _____ as the argument between the two motorists became more bad-tempered.
| A．swollen | B．raised | C．developed | D．increased |
.A number of cars ______ in front of the park
| A．is parked | B．was parked | C．are parked | D．has parked |
.The number of articles published on smoking ______ amazing.
| A．is | B．are | C．were | D．have been |
.The majority of doctors ______ smoking is harmful to health.
| A．are believed | B．had believed | C．has believed | D．Believe |
.The majority of the damage ______ easy to repair.
| A．is | B．are | C．were | D．Be |
.Four-fifths of the crop ______.
| A．are ruined | B．was ruined | C．were ruined | D．have been ruined |