—You look tired. —Yes. I _____ non-stop until twelve o’clock.
As the report said, the shopping center was a ________ failure and soon closed.
—I’m sorry. I shouldn’t have been so rude to you. —You ________ something not very nice to me, but that’s OK.
The mother, ________ in the kitchen, totally forgot the medicine on the table within the child’s reach.
To use a foreign language effectively, you need to understand the culture________ it is spoken.
In Singapore, people who litter and dirty the streets are more likely ________.