Before using this camera,you'd better read the new __ first(introduce)

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• Complete the sentences with the phrapter.The first letter is given to you .1.The novel c______ 11 chapters with about 30 thousand words.2.In China,the Spring Festival s______ the beginning of the new year.3.The rabbit was frightened and disappeared i______.4.You can read each word a ______ three times so that you can remember them.5.Mother finally d______ the preaenta to buy for her son one week before his birthday.
• Before using this camera,you'd better read the new __ first(introduce)
• You'd better （ ）before you（ ）.
• 集合A={x｜x=3n+1,n∈Z},B={x｜x=3n+2,n∈Z},C={x/x=6n+3,n∈Z}1）若c∈Z,求证：必存在a∈A,b∈B,使c=a+b2)对任意的a∈A,b∈B是否一定有a+b∈C?试证明你的结论