During the Civil War, Steam Boating on the lower Mississippi River was ________．

A．ruined

B．delayed

C．destroying

D．damaging

Now the young people are ________ the better work in the future．Which of the following is WRONG?

A．prepared for

B．preparing themselves for

C．preparing to do

D．prepared to

Aunt Liu is busy ________ breakfast for us．

A．preparing

B．preparing for

C．prepared

D．prepared for

Every morning he received bread ________ from the best flour．

A．prepared

B．worked

C．done

D．prepared for

He couldn't understand Mrs．Liu and ________ her school．

A．broke away from

B．broke down

C．break in

D．break out

Her room was ________ last night, and almost everything valuable was stolen．

A．broke in

B．broken into

C．broke away

D．broken out

The practice of children working in factories has nearly ________．

A．died off

B．died out

C．died

D．died down

The tiger is in danger of ________．

A．dying out

B．dying off

C．dying of

D．dying from

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

________ students went to see Mr．Wang during the time he was ill．

A．The number of

B．A number of

C．The large number of

D．A large number