. A variety of courses ________ offered to enrich the students’ background knowledge of the English-speaking countries.
It is obvious to the students ________ they should get well prepared for their future.
I didn’t hear the phone. I ___ asleep.
This monument was built ______ the little hero.
We do morning exercise every day, from which we ______ a lot.
—Have you made an apology ______ him ______ breaking his window? —Yes, I have.