The price of houses ______ from 200 000 to 300 000 pounds in the suburb of London during this winter.
| A．changed | B．ranged |
| C．separated | D．differed |
The Chinese people _____hard-working and brave.
| A．are | B．is | C．has been | D．are being |
Nobody ____to smoke in the cinema.
| A．allows | B．allow | C．is allowed | D．are allowed |
The air in big cities _____very dirty by factories.
| A．are often made | B．is often made | C．have often made | D．has often made |
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 |
All but one ____here just now.
| A．is | B．was | C．has been | D．were |