He is a very careful man, but he ________ make mistakes which seem ridiculous
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 ________.
Thanks to Ms Smith, the father and the son eventually________ after ten years’ cold relationship between them.
The income of skilled workers went up. ________, unskilled workers saw their earnings fall.