The first textbooks ______ for teaching English as a foreign language came out in the 16th century.
It came as ___ shock to learn that Bob, one of the top students in our class, failed in____ exam.
Tom kept quiet about the accident ________ lose his job.
With a lot of work _______, I can’t go to the cinema with you after school
—What has ________ done since 1989?. —It has built many schools for poor children .
—Thank you for your help. — ___________.