There was a time ________ this kind of skirt was very popular.
The good thing about children is that they very easily to the new environments.
---- Let’s go to cinema. ---- That’ll take your mind off the problem for while.
The job was a great challenge and the bad weather _________ our difficulties.
It is said that this is the biggest lab ________ they have ever built in their school.
In order to attract more customers, many supermarkets usually sell their goods at a good________ at weekends.