Please be serious. I am not _______. You should consider it carefully
B
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He_______tostudyharderinthefuturesothathecouldhavemoreopportunitiestofindabetterjob.
Pleasebeserious.Iamnot_______.Youshouldconsideritcarefully
Ifyouhaveanyproblemsduringyourstudyhere,pleasedonot_______tocallmeforhelp
Manykindsofanimalsarebelievedtohave_________fromtheearth