The book has been translated into thirty laguages since it ____ on the market in 1973.
I’m continually losing my pens these days. I ______ them on my desk, but they disappear somehow.
Sparing no thought for her own safety, she dived into the river ______ the child.
Visitors can see the large diamond, ______ has been kept at the Tower since the 17th century.
—Sorry, I forgot to lock the door. —______ Mike can do it later.
—Do you know ____ made him successful in his career? —Yes. His hard work and determination, of course.