They are not only a source of ______, but also an important way of learning.
The teacher came to the classroom and demanded ____ what had happened.
A love marriage, however, does not necessarily ____ much sharing of interests and responsibilities.
Doing your homework is a sure way to improve yor test scores, and this is especially true ____ it comes to classroom tests.
I haven' t seen Mary these past few days. I m afraid she ____ herself for some time.
Not far from the club, there was a girden, ____ owner seated in it playing bridge with his children every afternoon.