1 . On the bus, all the people except the driver ______ to talk and laugh during the journey.

A．encouraged	B．were encouraging
C．were encouraged	D．was encouraged

2 . The woman, when _______ how her husband was injured, began to cry.

A．asked	B．to ask
C．asking	D．ask

3 . — Why are you still here! Everybody has gone to attend the lecture by the president!
— Oh, I ____ about it!

A．wasn’t informed	B．didn’t inform
C．haven’t informed	D．hadn’t been informed

4 . My English teacher, as well as her students, ____ to perform at the party last night.

A．were invited	B．was invited
C．have been invited	D．has been invited

5 . Most environmental problems exist because adequate measures for preventing them ____in the past.

A．not being taken	B．didn’t take
C．were not taken	D．haven’t taken