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.

Peter is busy at school,but he never forgets exercise everyday.

Who helped you clean the classroom yesterday—_______. I did it all by myself.

How do you find the TV series Red Sorghum adapted from Mo Yan’s novel—________. I can’t think too highly of it.

The Red Cross goes into areas _______ help is badly needed.