( 1 ) 毒药，有毒，毒死
1. Not all snakes are __________.
2. We can sometimes be __________ by bad food.
3. Hate is a __________ for which there is no antidote(解毒药).

( 2 ) 有礼貌，有教养
1. Bob __________ stood aside and let the lady go through the doorway first.
2. The children from that school are known for their __________.
3. It is __________ to say "Thank you" and to open doors for people.

( 3 ) 政治，政治的
1. He left his own country for __________ reasons.
2. "__________ is much more difficult than physics," said Einstein.

( 4 ) 弄脏，污染
1. All those waste products are __________ the rivers.
2. The new law will reduce ____________ of the air.

( 5 ) 可能，或许，可能性
1. They didn't see any __________ of improvement.
2. __________ we'll meet again soon.
3. I'll help you if __________.
4. "When are you going to see him?"
　"As soon as __________."

( 6 ) 力量，能力，权力，有力的，强大的
1. Knowledge is __________.
2. He's very ____________ built.
3. __________ nations sometimes try to control weaker ones.

( 7 ) 实践，实际，练习，实用的，实际的
1. __________ makes perfect.
2. Knowledge without __________ makes but half an artist.
3. He is __________ the piano now.
4. They are __________ singing the new song.
5. The paper seems to me of no __________ importance.

( 8 ) 压， 压力，挤，按
1. He's always been frightened of his blood __________.
2. __________ this button to start the engine.

( 9 ) 发音，读音
1. He __________ his words clearly.
2. The "b" in "debt" is not __________.
3. There are many words that have more than one __________.

( 10 ) 真的，真正，确实，现实
1. This story is not __________, it is only imaginary.
2. We __________ must be off.
3. This is not imagination, but __________ .
4. It is __________ very good of you to do this for me.

答案：
( 1 ) 1. poisonous　2. poisoned　3. poison
( 2 ) 1. politely　2. politeness　3. polite
( 3 ) 1. political　2. Politics
( 4 ) 1. polluting　2. pollution
( 5 ) 1. possibility　2. Possibly　3. possible　4. possible
( 6 ) 1. power　2. powerfully　3. Powerful
( 7 ) 1. Practice　2. practice　3. practising　4.practising
　　5. practical
( 8 ) 1. pressure　2. press
( 9 ) 1. pronounces　2. pronounced　3. pronunciation
( 10 ) 1. real　2. really　3. reality　4. really