Вычеркни лишнее слово thirteen, eighteen, eleven, fifteen/see, three, tree, pen

he/she/it was,  it was  he  /she  ?   he/she it not was    wasn`t            we were.were we.we  were,were we? we were not  weren`t    .you were,you were,you were not weren`t.they were,where they    .they were not weren`t                                                                                                                                                                                                                                                                                                                                                                                         

he must know some foreign languages. he  must work now over the new novel. now they must enjoy fine weather.