It _____ last week that the haze(雾霾)in Beijing caused many problems.
The little girl felt upset ____ her pet dog died.
_____ is necessary for us to finish the work in two days.
—Why does Jane feel so upset? —She failed the exam and she has no friends ____.
At the beginning, I found it hard to get up early. Now I _____ it.
The weather in Beijing is not ____ good ____ that in Hainan.