You ____ swim here. It is said that sharks(鲨鱼) have beenseen.

.Water can absorb and _______ a lot of heat without big changes in temperature.

The infrastructure of a country is makes everything run smoothly，including things like transport， irrigation， electricity，postal service， telephones and schools.

________ around the fire, the tourists danced with the local people.[ ]

With his horse ____to the tree, the man had a rest in the shade.