______has helped to save the drowning boy is worth praising.
The bell ____ the end of the period rang and we had to stop our discussion
—Where did you find the professor who made the speech yesterday? —It was in the hall ______ the students often have a meeting..
Sorry to disturb you, ______ could I speak to you for a few minutes?
I wasn’t interested in the film at _____ first, but after ____ time I began to like it.
—Tom, you the lazy bone! You left the dishes unwashed again! —_______? Mom isn’t at home and she can’t hear you.