It is difficult to ( ) the competition from overseas companies when they are able to hire workers at less than a fifth of what we have to pay.
1. keep on about
2. keep in to
3. keep up with
4. keep on at
It is difficult to ( ) the competition from overseas companies when they are able to hire workers at less than a fifth of what we have to pay.
1. keep on about
2. keep in to
3. keep up with
4. keep on at