第一节 单项填空 （共20小题：每小题1分，共20分）
从每题所给的A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项图黑。
1.Have you got a free evening next week?        ,let’s have dinner.
  A. while so B. Since so    C. When so   D. If so
2.       of danger in the street at night, she had to go home, with a friend        her.
  A. Warned; accompanied                     
B. Having warned; accompanying
C. Warning; accompanying                   
D. Having been warned; accompanying