第一节 词汇运用（共10小题。每小题1分，满分10分）

◆ 选择括号内恰当的单词填入空白处，使句子完整、正确。 

77. ―We must drive more slowly.

   ―It should be.            (So/ Such) many cars are on their way back after the Spring Festival.

78.―Thank you for your            (value/ valuable) help and practical suggestions.

―That’s all right.

79. ―Dad is working. Would you mind           (keeping/ not keeping) your voice down, please?

   ―I’m so sorry.

80. ―What a cold day!

―Yes, the temperature stays            ( under/ below) zero.