The headmaster was______ as to how to inform her of the news that her daughter failed to pass the exam again.
People in the west make ____ a rule to buy Christmas presents for their relatives and friends.
--- What are you going to do tomorrow? --- I will go _____ with my friends on the lake.
You _____ practise the drums while the baby is sleeping.
After the new equipment was introduced,they produced ________machines this year as the year before.
He is famous both ______ a novelist and a poet but he is more famous ______ his novels.