unit1
    unhappy problem bad square test advice famous real joy diving
    climbing speaking camping laugh thought solve smiling not to be to give,
    to become,
    healthy healthily, bored, more, singer, more dangerous, pleasant, the most nervous, interesting, the worst, slimmer,
    BCDDA DCBDB CBADB
    BDCBD ACBDA
    unit2
    一 heroes, tasty, subject, seniors, admired, article, geography science unimportant, practicing, languages, history,
    二 visitors, useless, fewer less, twice, mixed, myself, driving, unpopular, pleasant, boring,
    三DCAAB ACDAD BBAAD BACDB BBCAA
    四 help, doesn’t rain, asking, chatting, is going to be doing, opening, put ran, to be, washing, will arrive, arrives will have talking
    unit3
    一 to meet, themselves, to close clean, inviting, buildings, beginning, more, interest, amazing, visiting
    二to go on a trip to places of, to visit, whole front of, took by, to join in to,
    三invitation, interesting, quickly, yourself, beauty,
    四，ADBAC CDBAA
    五 had fun, at the beginning, feel sick, felt exited, places of interest, in front of
    六 called, keeping, to have, climbers, winner, snows, less doing, players, walking, alike
    七 1 it is big and white. 2 we should protect them
    3 they kill them for their beautiful white coat.
    4they live in the snow and ice. 5 A
    unit4leaves, encourages, elephants’ hunting, least, badly, to protect, characters, smells, sharp well