Please fill the gaps with suitable words:

1. I could ....... bought that car but I didn't have enough money to pay for the petrol.
(a) had (b) have (c) have to

2. I ....... speak French without a problem now because I have had many lessons.
(a) may (b) can (c) hav

3. When will you ....... come and see us in our new house?
(a) can (b) be able to (c) must