小题1:.. You can find out the reason for this f__________ (失败).

小题2:.. No one can a__________ (取得成就) anything without effort.

小题3:.. That rich man has a large staff of s__________ (仆人).

小题4:.. He made a v__________ (航海) to Australia last year.

小题5:.. O__________ (氧) is a gas without color, taste or smell, present in the air and necessary for us all.

小题6:.. The d__________ (密度) of the fog made it difficult to see where we were going.

小题7:.. People of different r__________ (种族) may have different colors of skin, hair and eyes.

小题8:. The r__________ (逃跑的) slave was caught by his owner and was almost beaten to death.

小题9:.. “You never ask my opinion about anything,” Rod c__________ (抱怨).

小题10:.. S__________ (有经验的) teachers have the experience needed to make their lessons interesting.