After a series of food safety incidents, the government has ______ that not enough has been done to guarantee people green and healthy food.
When I talked with my grandma on the phone, she sounded weak, but by the time we ___ up, her voice had been full of life.
. Gun control is a subject Americans have argued for a long time .
It is generally said that man’s desire is hard _______.
Every evening after dinner, if not________ from work, I will spend some time walking my dog.
Doctors recommend that all children ________ vaccinated against measles(麻疹).