1.、in the light of recent discoveries it may be necessary to

1.、in the light of recent discoveries it may be necessary to revise our previous theory.
为什么用in the light of ,不用in line with
2.washing the food down with water a substitute for chewing is not a good habit.
3.i asked him to spare me a few minutes so that we could go over all the problems.
4.this type of desk and chair can be adjusted to the height of studentsat different ages.
5.a formal is preferable to a casual one for such an occasion .为什么用preferable,不用不用suitable.