Nowadays teachers tend to be more dependent on ________ is thought to be a great teaching aid—the computer.
He is the only one of the students who________a winner for three years.
—Jack, you erase the blackboard today,______? —But I erased it yesterday.
The police finally found the robber ______near a river_______
You can’t shut your eyes to the fact _______he did was right.
I must thank my parents ___________ to be a college student.