Earthquakes always happen , so it is difficult to know when they come.
----Jack, _________ the picture. ----Oh, it _________ so beautiful.
My father says he has no time to ________ newspapers in his office.
----What does your mother like doing at the weekends? ----She enjoys _______ with her friends.
----________ Tom and his mother often watch tennis matches on TV? ----Yes, they _________.
With a computer and a projector(投影仪), our classroom looks very _________.