The faces of four famous American presidents on Mount Rushmore can be seen from a ________ of 60 miles．

A．length

B．distance

C．way

D．space

The Red Cross sent the old man a letter to express thanks for his ________ donation and help．

A．brave

B．violent

C．generous

D．honest

A pilot's job ________ be boring, and they often ________ work at inconvenient hours．

A．can; have to

B．may; can

C．have to ; may

D．ought to; must

A spacecraft can go back and forth between ________ space and ________ earth．

A．the, the

B．/, the

C．the,/

D．/,/

The young boy is always trying to ________ his shortcomings, which I appreciate most．

A．take up

B．make up

C．put up

D．bring up

I think the boss, rather than the workers, ________ to blame for the fire that caused so many deaths．

A．are

B．were

C．was

D．to be

Finally, the two brothers climbed up the last floor, ________．

A．hungrily and tired

B．hungrily and tiredly

C．hungry and tired

D．hungry and tiredly

It is not clear ________ the price can be controlled from rising．

A．why

B．what

C．whether

D．that

I refuse to accept the blame for something ________ was someone else's fault．

A．who

B．that

C．as

D．what

________ her address, we couldn't get in touch with her．

A．Not to know

B．Having been known

C．Not knowing

D．Not been known