Hearing the bell ringing, out .
Many cities issued a warning of air pollution for PM-2.5 readings, which became Concern of all the people
______ many times, my elderly mother still can’t remember how to light the gas.
---The window is dirty.---I know. It ______ for ages and I’m considering giving the task to our children.
As a young minister, he was full of ______ ideas for social reform.
I’m glad to hear a new school building has been put up ______ once lay an abandoned cinema.