Our physics teacher told us that the light much faster than the sound.

Only by learning more about different cultures _______ avoid misunderstanding during international cooperation.

Mom, my little sister is crying all the time.——Mary, be ________! She feels unwell. You should take good care of her.

I believe this is the best movie of the year.— Well, .Anyway, the ending is OK.

Can he work out the maths problem—-I think _____ hard for him to work itout.