_____ the new policy, we are now having a happy life.
The best times to visit Shangri-la are spring and autumn ____ the temperature is at its mildest.
Scientists study ____ human brains work to make computers.
______ in the school campus in spring, we will always noitce a colorful display of flowers.
It’s great that all the visitors who _______ on the island were saved.
The operation is _______ success. and the patient is now out of ______ danger.