The life of a high school student is usually active, exciting and full of fun, but it ______ be stressful sometimes.

We __________  back in the hotel now if you didn’t lose the map.

Cars play an important role in modern life, but they_______also cause many problems like air pollution．

The boss ordered that the work ______ right away.

---How did you do in the test yesterday? -----Not so well. I ______ much better but I misread the directions for writing。