While reading an interesting story book in my room，______________.
| A．the light suddenly went out |
| B．the doorbell rang |
| C．someone was shouting outside |
| D．I heard someone shouting outside |
.Neither Tom nor his parents ______ at home.
| A．is | B．are | C．has | D．Was |
.Either the dean or the principal ______ the meeting.
| A．attends | B．attend | C．are attending | D．have attended |
.______ was wrong.
| A．Not the teacher but the students | B．Both the students and the teacher |
| C．Neither the teacher not the students | D．Not the students but the teacher |
.“______ twenty dollars a big sum to her?” “I suppose so.”
| A．Will be | B．Is | C．Are | D．Were |
.Three hours ______ enough for us to finish the task.
| A．are | B．has | C．is | D．Were |