We hung a net round the bed, which could protect us _____ mosquitoes and other insects.

The sentence，which puzzled John，was also    me and we had to turn to our English teacher for help.

He likes novels very much , while I love science fiction _________ .

Everybody was touched _______ words after they heard her moving story．

I was greatly impressed __________ the speech by the mayor of Shanghai before the final voting for EXPO 2010.

Jack looked very calm ________ the quarrel with his desk mate.

This new type ______ camera is ______ high quality and is not expensive.

Whenever something goes wrong, everyone blames it ___ me.

Scientists are convinced _____ the positive effect of laughter _____ physical and mental health．

He is giving her French lessons in ________ for her teaching him English．