1. To take someone hostage means to keep, or retain a person or group of people until a specific demand is met. (hostage = rehén)
2. To a have a grudge against someone means tenerle/guardarle rencilla/rencor a alguien. – also to bear a grudge or hold a grudge against someone
3. To make a mockery of something = ridiculizar algo
4. To do harm is hacer daño
5. To make a stop means to have a break in the middle of a journey.
6. To make a fortune = hacer una fortuna
7. To take the lead means llevar/tomar la delantera
8. To do well = tener éxito (opposite = to do badly)
9. To make a model = hacer un modelo
10. To do research = investigar, hacer investigaciones