把下列单词填入每个句子的空白处（注意所填单词的形式变化）：
hero quality willing active republic principle fight prison period advise continue youth league stage vote position accept violence peaceful blanket degree guard educated terror fear cruelty reward criminal president sincerely
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1 The Society for the Prevention of _________ to Animals (SPCA 动物保护协会) is a well known organization in the world.
2 The girl wrapped herself with a _________ to keep herself warm.
3 The famous actress first appeared on the _________ only in her teens.
4 The two boys who were _________ in the playground were ordered to stop.
5 People regarded him as a ________, for he saved a drowning 8-year-old boy out of a freezing lake.
6 You really deserve a _________ for being so helpful.
7 My uncle received a doctor’s _________of medicine in America in 1998 and returned to China the following year.
8 He obtained 89% of the __________ and was elected president of the Party.
9 Nelson Mandela was put in ________ a few times.
10 People often value the _________ of a product rather than its packaging.
11 The _________ was charged with robbing a bank and sentenced to death.
12 Two soliders _________ the government office building all the time.
13 My father was promoted to a higher _________ for his achievements.
14 I stayed in Japan for only a short _________ of time.
15 Those boys are so helpful that they are always ________ to help others.
16 George Bush was elected _________ of the USA a second time in 2004.
17 All my family are well _________, of whom my brother studied in Harvard University.
18 I am a Party member and never ________any bribe(贿赂) from others.
19 The doctor _________ me to take more exercise so that I can keep fit.
20 Some students are very ________ in answering teachers’ questions while others just keep silent when asked any question.
21 I _________ hope that you won’t let me down.
22 To his ________, he found a figure coming towards him in the darkness.
23 What really worries those parents is that there is too much sex and _______ on TV.
24 The rain ________ falling all afternoon. But it came to a stop by dark.
25 PRC is short for the People’s _________ of China.
26 His son has been missing for five days and now police are beginning to _______ the worst.
27 After retirement she moved to the country and lived a ________ life.
28 The _________ play an important role in building our country.
29 I have been a ________ member for 3 years.
30 Stick to your ________ and tell him that you won’t do it.
在（0，+∞）上都是减函数，则y=ax2+bx在（0，+∞）上是 
如图是一条软绳，绳上选有18个质点，质点1在外力作用下首先向上振动，其余质点在相互作用力的带动下依次振动，从而形成简谐波．由波的形成及图示可知，下列说法中不正确的是（ ）
