En este ejercicio trabajaremos la diferencia entre los diferentes tipos de habilidad en el pasado: habilidad duradera vs. habilidad de hacer algo en una situación específica. Completa el texto con could o was/were able to y los verbos entre paréntesis, en afirmativo o negativo.

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
1. The police (catch) the thief shortly after the robbery.
2. He (cycle) for hours when he was a kid and he wouldn't feel tired.
3. She (not/ write) until she was 10.
4. We (not/ fix) the central heating, so we had to call the technician.
5. The house was on fire, but he (escape) through the chimney.
6. People (not/travel) abroad under the communist regime.
7. I (study) all day and all night when I was a student.
8. She (answer) all the questions, so she failed her exam.