Вопрос по английскому языку:

Fill in the gaps with the right form of the verb:
Use: was able, have to, shouldn’t, will be able, couldn’t, could, can’t
1. When I looked at the test, I _____ answer many questions.
2. My camera doesn’t work, so I _____take any pictures.
3. If I learn English, I _____ to understand people abroad.
4. The singer had a sore throat. However, she _____to sing at the concert.
5. He _____ sing very well when he was twenty.
6. You _____ eat a lot of sweets.
7. They didn’t _____ go to school l