One of our rules is that every student_____wear the school uniform while at school．
| A．might | B．could | C．shall | D．will |
The number of people invited __________ fifty, but a number of them __________ absent for different reasons.
| A． were ; was | B．was ; was | C．was ; were | D．were ; were |
____________ people in the world are sending information by E-mail every day.
| A．Several million | B．Many millions | C．Several millions | D．Many million |
The discussion_______________alive when an interesting topic was brought in.
| A． was coming | B．had come | C． has come | D． came |
My mind wasn’t on what he was saying so I’m afraid I________________half of it.
| A． was missing | B． had missed | C． will miss | D． missed |
All the preparations for the task ___________, and we’re ready to start.
| A． completed | B．complete |
| C．had been completed | D．have been completed |