Recently I bought a beautiful car, ________ was reasonable.
Nuclear science should be developed to guard peace ____ destroy the world.
—Has the doctor _______the old woman of her illness? —No, he ______ her but didn’t ________ her.
—Is the White House _________ to ordinary visitors? —Of course.
The little boy was allowed to go swimming _______ he kept near the other boys.
—It’ll take me at least 2 hours to do this! —Oh, _______! I could do it in 30 minutes.