o teaching, as we know, contributes to his popularity with his students.

Why did Tom go to bed so late yesterday—Because his homework _______ on time.

If transport costs_____ into consideration at the beginning, the factory would have been built far from its present place. [ ]

Can you come to attend our party tonight?— Sorry, but I do wish I ____.

The manager has _____to improve the working conditions in the company. [ ]