1 were

2 get frozen

3 were

4 had not disturbed

5 build

1 I wish it were summer holidays now.

2 If the temperature drops below zero, rivers and lakes get frozen.

3 If I were you, I would book the tickets.

4 She would have finished the work in time if the children had not disturbed her.

5 There will be no stray animals if we build animal shelters.