---Look! Why are there so many people?---There are some policemen. I think there must be a traffic accident _____in the street.
______useful advice we had in the meeting last week!
_______animals are in danger and there will be _______space for them if we do nothing for them.
Good hotels can provide us _______hot water even at night. And it can also provide food ______us any time.
______nature reserves _______us learn more about protecting animals.
—____________? —It was sunny and windy.