基本信息
第一节、单项填空（共15小题，15分）
从各题A、B、C、D四个选项中, 选出可以填入空白处的最佳答案。
21. It is ______ comfort to know there’s someone to keep ______ eye on the kids.
A. a; anB. /; /C. /; anD. /; the
22. — I’d like to reserve a single ticket to Beijing.
— Sorry, sir, but we don’t have any tickets ______ at the moment.
A. usableB. availableC. suitableD. stable
