John has two brothers， but either ____out of work now.
| A．are | B．is | C．has | D．have |
____can be done _____been done.
| A．All； have | B．All that； have | C．All； has | D．All that； has |
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 |