_____some English-learning websitesif you are free, and you will learn a lot about how to study English.

It worried her a bit ____ her hair was turning grey.

Have you really realized the part computer has________ in the daily life?

I often see him working hard in his spare time —________he has won the scholarship from time to time

Our government has tried many ways to the smog haze (雾霾) problem. Maybe we’ll have a clear sky in the near future.