When he returned , he agreed to the publisher’s request _______ he should write a book for boys based on the life he experienced.

Walter offered us a lift when he was leaving the office, but ________our work, we declined the offer.[ ]

There’s a policeman over there . Let’s ask him ________.

assroom is crowded with children_____have poor eyesight, all of ____ interested in painting.

Isn’t that book so boring—___________. You can know a lot about wild animals.