Why are you so anxious? It isn’t your problem _____.
--- Why do you look sad?---There are so many problems ______.
--- What has happened here?--- There was ______ accident here about an hour ago. ______ car hit a tree and ______ driver was killed.
We can’t get the machine to run. There must be ______ with it.
Only ______according to the directions can the medicine be quite effective.
--- I promise her daughter ______ get a nice present on her birthday.---Will it be a big surprise to her?