I regret _______ that I’m busy ______ my lessons.
The little boys were tricks on the girl when their teacher came into the classroom.
You did not perform as well as the other competitors--- ,you failed.
I like getting up very early in summer. The morning air is so good ______.
The fire made _____ difficult to rescue the people trapped under the ruins in the earthquake.
The mother waved to her daughter until the train .