The reason ________ she gave for not being present was ________ the heavy snow prevented her coming.

I felt it hard to keep up with my classmates. But whenever I want to_ _, my teacher always encourages me to work harder.

I first met Lisa three years ago. She ________ at a radio shop at the time.

Had we assisted him , he ________ us a hand________ today .

He ___ go to work by bus, but now he ___ riding a bicycle to work.