--- Where are the students ? How could they keep us waiting for so long? --- They started an hour ago and they____ be here in fifteen minutes, I think.
Where's the book I gave you? What ________ it?
The boy will make a lot of trouble when __________ alone.
Allow children the space to voice their opinions, ____they are different from your own.
Peter has been out of work for half a year, so he wants to ______a job in this company.
.—I’m sorry to have brought you so much trouble. — _________.