一、单项选择（本题共15小题；每小题1分，满分15分）
从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涂黑。
1. When I ride my bicycle, I usually get off and walk _______ the street.
A. round B. across C. through D. over
2. Grades are really important, but they’re not ______ to us students.
A. something B. nothing C. anything D. everything
3. Jane likes to give her students a lot of _______ on how to improve their English.
A. suggestion B. advice C. problems D. messages
