John_______tobeapoliteman.Butinfactheisveryrude.
He_______tostudyharderinthefuturesothathecouldhavemoreopportunitiestofindabetterjob.
Inordertoincreaseouroutput,weneedtoimportmoreproduction_______.
Manykindsofanimalsarebelievedtohave_________fromtheearth
Itisnot---_______formetoreturnallthebookstothelibrarynowbecauseIstillneedsomeofthemformyresearch.