_____ maths is concerned, Tom is the best student in our class.
It was not until late in the evening _____ her husband arrived home.
The telephone _____ three times in the last hour, and each time it _____ for my sister.
____ the movie star has always been the focus of much media attention, he tries to lead a normal life.
Due to the unreasonable individual income _______, the gap between the rich and poor has become an outstanding issue.
Shanghai authorities have guaranteed the quality of the city’s drinking water _____ more than 7500 rotting pigs ______ floating on the Huangpu River in the past week.