All these gifts must be mailed immediately__________ in time for Christmas.
83. Although she tried her best to make her work _______, yet she failed in the end.
82. Don't be in such a hurry. There are _______ passengers in the bus.
81. Our cadres, whether high or low in their official rank, are the people’s public servant and _____workers.
80. Materialism is to idealism just as truth is opposed to falsehood.
79. Such a grammar mistake is ______ among the beginners of English study.