Заполните пробелы с can и must или их эквивалентами. В некоторых предложениях может быть более одного варианта.
1 I go to the swimming pool three times a week. 1 hope I ... swim quite well by next summer.
2 Do you know that cats ... see very well in the dark?
3 Some animals ... do without food for a very long time. Snakes, for example ... survive the whole winter without eating.
4 When I was a little girl, I ... do acrobatic feats (трюки), but now I can't.
5 There are no tickets for our flight so we ... go by train.
6 If there is not going to be any information about those passengers till tomorrow morning, we ... call the police.