Заполните пропуски модальными глаголами сап и must или их аналогами. В некоторых предложениях возможно более одного варианта.
1) I go to the swimming pool three times a week. I hope I will be able to swim quite well by next summer.
2) Do you know that cats can see very well in the dark?
3) Some animals can do without food for a very longtime. Snakes, for example, are able to survive the whole winter without eating.
4) When I was a little girl, I could/was able to do acrobatic feats, but now I can’t.
5) There are no tickets for our flight so we had to go by train.
6) If there is not going to be any information about those passengers till tomorrow morning, we will have to call the police.