Some social workers_____ different skills often meet at the centre.

Now I can’t find ______book about animals. —Is it ______ old picture bookon the desk?

He pretended to be a doctor，but ____ he is a cheat．

Many ______ Chinese cultural relics, which have been lost over ______ last century, have started to return home.

He was told that it would be at least three more months __________ he could recover and return to work.