In the last decade, disasters have become increasingly common. It’s high time that we ______these issues more seriously.
— So you missed the English class this morning? — ________. I arrived 20 minutes after it started.
The principal suggested ____ more exercise to build up our health.
Read this story, ______ you will realize that not everything can be bought with money.
Baoji isn’t ____ she used to be. Great changes have taken place in the past years.
Every possible means ______, but none proves successful.