―How come I didn’t get the message that we were to have the meeting at 4 pm? ―Well, your phone ________ it.
.The wallet _______ several days ago was found _______ in the dustbin outside the building.
.Lessons _______ easily were soon forgotten.
The ground is _______ with _______ leaves.
The library's study room is full of students _______ for the exam.
The scientists were waiting to see the problem _______.