11.   The ice is too thin to skate on.

12.   The ice was smooth but full of tiny air bubbles.

13.   The sea ice is now more than a metre thick.

14.   Very cold ice is very hard, and very cold permafrost is extraordinarily tough to cut through.

15.   Careful with that cigarette!be careful with something?

16.   The ice was not thick enough to bear the weight of marching men.

17.   Ice is only as safe as the water from which it is made, and should not be put in drinks unless it is known to be safe.

18.   They nodded, relieved that the ice was broken.

19.   In the nineteenth century such ice-houses tended to become redundant when ice was imported to this country from Norway and North America throughout the year.

20.   Instead of fire there was ice in her veins.