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【答案】1.yourselves 2.him himself 3.them 4.us them 5.her
【解析】
1.help oneself to sth请自便吃点东西,根据boys and girls,反身代词用复数,故答案为yourselves.
2. teach sb. sth.第一空用宾格;第二空by oneself,故答案为him,himself.
3. take动词后面用人称代词宾格,故答案为them.
4. let和join都是动词,后面用人称代词宾格,故答案为us,them.
5. to介词后面接宾格,故答案为her.