The air is deadly polluted because some factories don’t __the rules to protect the environment.
We have made _______great progress in the medical field, but ______ progress we have made is not enough.
I have many foreign friends, some are businessmen.
He used to ______ cards, but now he is used to _______ a walk after supper.
She is considered ___________ the work ahead of time.
None of them could understand your meaning, _________?