The ___ (difficult) is to stop students from talking.

The ___ (difficult) is to stop students from talking. There ___(be) something difficult in the book There ___(be) something difficult in the book The reading ___(材料) is difficult t understand. ___ (predict) the result can be very difficult. The math problem is so difficult that he can't___ ___ ___.他算不出来. The problem is difficult.I can't work it out.（连成一句）The problem isn't ___ ___ ___ ___ to work out. 1.they enjoy themselves in the park yesterday (改为同义句)they ___ ___ ___ ___ in the park yesterday2.我认为猪很难照料i think pigs are difficult ___ ___ ___ ___. the teacher asked Ben ___(answer)a difficult question适当形式 The course ___ more difficult as you go to higher gradesA getsB getC gotD getting I found it difficult ___ (get) to sleep in the night the English article is not very difficult because there are only ___ new worda in it some physics problems ___ the book are not difficult.A in B of 原因 we went throuh the period ___ communications were vary difficult in raral areas we thought ___ difficult for us to fly to the moon many years ago.ji the railway ___(connect) Qinghai to Tibet is yery difficult to build -The question Mr Brown asked wasn't ___ to answer.-Yes.Nobody could answer it.A.too easy B.too difficult C.easy enough D.difficult enough I can answer all the question ___ the last one.It's too difficult.A except B except for