在生活中,我们也许会遇到一些突如其来的天灾人祸。当火灾、溺水、车祸等灾难威胁到我们的生命时,我们应该( )
The Changjiang River is one of ________ in the world.
Linda born July 2nd ,1999.
--- Is your sister as serious as you? --- No, she isn’t. She is .
-Mona works really hard.-I agree. ___________she is ill, she still goes to school.
Be careful . You _______ cross the road when the traffic light is red . The traffic is heavy at this time of day .