Students are required to go out in couples, especially in the evenings, with friends ______ they get into trouble.
She was invited but she didn’t want to go to the party, so she________an excuse.
A lot of dirty clothes require ________ so she will not go out shopping this weekend.
--How about your trip to Italy? --Oh, ________ the fine weather, we enjoyed ourselves indeed.
--Which car is better, the red one or the black one? --I prefer the red one, but it is really a matter of personal________.
In the past several weeks, many cities in Northern China________from heavy fogs, causing great inconvenience to people.