-----Who ______ it be that hasn’t handed it in yesterday? ------It _______ be Bob. He handed it in yesterday.
How can a country where teachers devote all their class hours to training students to take exams _____ to compete in the technology race with other countries.
Man _____ profit, sometimes even being unaware of the harm he has done to the environment.
I’m glad to see that you _____ a lot of progress since I _____ you last.
More than one teacher _____ told him it is important that he learn English well if he _____ aboard.
The meeting was _____ at ten o’clock, but the chairman hadn’t turned up by eleven o’clock.