Sometimes I cannot but wonder ______ that has made me feel differently from the others.
Tom____ me your secret, but he meant no harm.
It’s really a great pity that the great writer died ____ his works unfinished.
It is hoped that there will be ____ time in the future when ____ man can defeat cancer.
Scientists warn us _____ the need to keep an eye ____ the greenhouse effect.
The old temple, which ______ to the 17th century, needs to be repaired.