If his parents are convinced ______ the fact that his son always focuses his mind _______his study.
The deer ____when the animals , harmful to them, disappeared.
The students entered the classroom, smiling and _______, and _____ down to have their lessons.
If your knowledge can be in some way ______ with my experience, we are sure to succeed.
If you put too many oranges in that paper-bag it will _____.
The physics teacher told the students to observe carefully what would happen when a (n) _____ acted on the object.