We __________ our lives had it not been forthe policeman.

It is essential that every child _______ the sameeducational opportunities.

－When I first got to Harvard, my terrible English was a burden to me.－Oh, dear, it ________ a struggle for you to keep up with other students.

Elizabeth believed the dog would die if_____ to her cruel owners so she kept it.

her _____ all the cleaning for my family, but recently she has been too busy teaching to do it.