(2013·北京卷) the course very difficult, she decided to move to a lower level.
Susan wanted to be independent of her parents. She tried ___________alone, but she didn’t like it and moved back home.
______the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.
I called Hannah many times yesterday evening,but I couldn't get through. Her brother_____ on the phone all the time!
The growing speed of a plant is influenced by a number of factors,____are beyond our control.
When asked _____ they needed most, the kids said they wanted to feel important and loved.