4. Сгруппируйте из следующих слов синонимические и антонимические пары. To sell, by means of, slow, varying, however, to be due to, to cause, aggregate, to speed, quite, to accept, rapid, to expect, a little, to happen, a number of, constant, entire, to accelerate, if, though, to purchase, total, to be caused, by, to result in, to take place, rather, to some extent, to adopt, through, temporary, whether, to buy, to anticipate, several, to occur, steady.