| A．were stone | B．were stones | C．was stone | D．was stones |
| A．involve | B．involves | C．involving | D．to involve |
| A．Both the singer and the dancer | B．Either the singer or dancers |
| C．The singer or dancers | D．The singer and dancer |
| A．is | B．are | C．were | D．be |
| A．is missing | B．has been missed | C．are missing | D．was missing |
| A．are believed | B．had believed | C．has believed | D．believe |
| A．have arrived | B．are arriving | C．had arrived | D．has arrived |
| A．had | B．has been having | C．are having | D．were having |
| A．is | B．are | C．were | D．have been |
| A．should be | B．must be | C．is | D．are |
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