1 . His suggestion is worth ________.

A．to consider

B．considered

C．to be considered

D．considering

2 . It is you rather than he that are to b___________ (责备) for the terrible accident.

3 . It was commanded that the survivors of the mine accident ______ (send ) to the nearest hospital. （用所给单词适当形式填空）

4 . My parents like climbing the mountain behind my home in the morning, because the mountainous air is so good ________.

A．breathing

B．breathed

C．to breathe

D．to be breathed

5 . This Russian program is difficult ______ for Chinese students.

A．understanding it	B．understanding
C．to be understood	D．to understand

6 . A local radio station said that several eruptions _____ in the past twenty years.

A．had been taken place	B．took place
C．have taken place	D．had taken place

7 . Your shirt needs ____. You'd better have it done today.

A．iron

B．to iron

C．ironing

D．being ironed